EVS XT2+ Use and care manual

Technical Reference
Hardware
Version 10.03 - July 2010
Production & Playout Server

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COPYRIGHT
EVS Broadcast Equipment – Copyright © 2002-2010. All rights reserved.
DISCLAIMER
The information in this manual is furnished for informational use only and subject
to change without notice. While every effort has been made to ensure that the
information contained in this user manual is accurate, up-to-date and reliable,
EVS Broadcast Equipment cannot be held responsible for inaccuracies or errors
that may appear in this publication.
IMPROVEMENT REQUESTS
Your comments will help us improve the quality of the user documentation. Do not
hesitate to send improvement requests, or report any error or inaccuracy on this
user manual by e-mail to [e-mail].

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Table of Contents
TABLE OF CONTENTS.................................................................................................... II
WHAT’S NEW?.................................................................................................................V
1.OVERVIEW............................................................................................................... 1
1.1XT[2] HIGH-RESOLUTION SERVER...........................................................................................1
1.2XT[2] PROXY SERVER ...............................................................................................................2
1.3UNPACKING................................................................................................................................2
1.4DIMENSIONS ..............................................................................................................................2
1.4.1Video Disk Recorder Main Frame 19 Inches...........................................................................2
1.4.2XT-HDX...................................................................................................................................3
1.4.3Remote Control Panel.............................................................................................................4
1.4.410” Touch Screen Video Monitor.............................................................................................4
1.4.518” Touch Screen Video Monitor.............................................................................................4
1.4.6Keyboard.................................................................................................................................4
1.4.7Tablet......................................................................................................................................5
1.5INSTALLATION............................................................................................................................5
1.6SAFETY, COMPLIANCE AND OPERATING CONDITIONS........................................................5
1.6.1Safety......................................................................................................................................5
1.6.2EMC Standards.......................................................................................................................5
1.6.3EMC Warning..........................................................................................................................6
1.6.4CE Marking .............................................................................................................................7
1.6.5Power Supply..........................................................................................................................7
Cold Swap..................................................................................................................................................................7
Hot Swap....................................................................................................................................................................8
Secondary Power Supply...........................................................................................................................................9
Grounding ..................................................................................................................................................................9
1.7VENTILATION & RACK MOUNTING...........................................................................................9
1.8HARDWARE CONSUMPTION ..................................................................................................10
1.9XT[2] SERVER MAIN SPECIFICATIONS ..................................................................................11
1.9.1Video.....................................................................................................................................11
1.9.2Audio.....................................................................................................................................11
1.9.3Video Codecs & Bitrates .......................................................................................................12
1.9.4Recording Capacity for XT[2] Servers...................................................................................13
1.9.5Supported SMPTE Standards...............................................................................................15
1.9.6Maximum Bitrate values........................................................................................................15
1.9.7AVID DNxHD ® and APPLE ProRes 422..............................................................................16
Introduction ..............................................................................................................................................................16
Video Bitrate Compatibility with Avid and Apple Products.......................................................................................16
Choices of Bitrates when using Avid DNxHD® or Apple ProRes 422 with EVS XT[2] servers ...............................17
Important Recommendations...................................................................................................................................21
1.9.8Raid level: 3 ..........................................................................................................................21
1.9.9Interpolation ..........................................................................................................................21
2-line Interpolator.....................................................................................................................................................22
4-line Interpolator.....................................................................................................................................................22
2.CABLING................................................................................................................ 23
2.1XT[2] 6U BACK PLANE, MULTICAM MODE .............................................................................23
2.2XT[2] 4U BACK PLANE..............................................................................................................24

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2.2.1(XT[2]H-4-A3) Shown with Optional AES on BNC Connector Option....................................24
2.2.2(XT[2]H-4-A3B) Shown with Optional AES on Multi-pin Connector Option ...........................24
2.3GPI IN CONNECTIONS.............................................................................................................25
2.3.1Relay ÆOpto Inputs on the XT Server (GPI inputs 1, 2, 3, 4) .............................................25
2.3.2Relay ÆTTL Inputs on the XT Server (GPI inputs 5, 6, 7, 8)...............................................25
2.3.3TTL ÆTTL Inputs on the XT Server (GPI input 5, 6, 7, 8) ...................................................26
2.4GPI OUT SETTINGS .................................................................................................................26
2.5MTPC GPIO CONNECTOR 15/10/02 ........................................................................................26
2.5.1GPIO Connector: SUB-D 25-pins Male.................................................................................26
2.5.2GPIO Hardware Specification ...............................................................................................28
2.6RS422 CONNECTOR ................................................................................................................29
2.7AUDIO CONFIGURATIONS ......................................................................................................30
2.7.1CODA FOR XT[2]..................................................................................................................30
2.7.2PIN ASSIGNMENT ON SUB-DB15 CONNECTORS ............................................................30
2.8CONNECTING MULTIPLE EVS VIDEO SERVERS ON XNET .................................................31
2.8.1Connection Diagram without EVS XHub SDTI HUB .............................................................32
2.8.2Connection Diagram With EVS XHub SDTI HUB..................................................................33
2.8.3Required Conditions to Set up and Run XNet.......................................................................34
2.8.4Starting XNet.........................................................................................................................35
2.8.5XNet Performances & Troubleshooting.................................................................................36
2.9GIGABIT NETWORK .................................................................................................................37
2.9.1Functional Overview..............................................................................................................37
2.9.2Backup of Clips .....................................................................................................................38
2.9.3Restore of Clips ....................................................................................................................39
2.9.4Switches................................................................................................................................40
Supported Switches.................................................................................................................................................40
Comparison..............................................................................................................................................................41
Additional Information ..............................................................................................................................................41
2.10REDUNDANT IPDP SERIAL LINK.............................................................................................42
3.HARDWARE DESCRIPTION................................................................................. 43
3.1BOARDS AND SLOT CONFIGURATIONS................................................................................43
3.1.16U Frame..............................................................................................................................43
3.1.24U Frame..............................................................................................................................43
3.2VIDEO AND REFERENCE BOARDS ........................................................................................44
3.2.1COHX Board .........................................................................................................................44
Jumpers on the COHX Base Module.......................................................................................................................45
Leds on the COHX Base Module with Genlock .......................................................................................................45
Leds on the COD A and COD B Modules (from Left to Right).................................................................................46
Connectors on the COD A and COD B Modules .....................................................................................................46
Channel Assignment................................................................................................................................................49
3.3AUDIO CODEC BOARD ............................................................................................................51
LED Information and Connector...............................................................................................................................51
3.4RAID CONTROLLER BOARDS .................................................................................................52
3.4.1HCTX board ..........................................................................................................................52
Jumpers ...................................................................................................................................................................52
LEDs ........................................................................................................................................................................53
Connectors...............................................................................................................................................................54
Gigabit Connectors ..................................................................................................................................................54
3.4.2RCTL Board on Disk Array (with HCTX) ...............................................................................55
LEDs ........................................................................................................................................................................55
3.4.3External RAID Array XT-HDX for XT[2] Server .....................................................................56
Installation and Operation........................................................................................................................................57
Disk Organization.....................................................................................................................................................58
LED Status...............................................................................................................................................................58
How to Replace a Disk.............................................................................................................................................59

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3.5MTPC BOARD ...........................................................................................................................59
3.5.1Introduction ...........................................................................................................................59
3.5.2A2/A3 and A2/A4 Board........................................................................................................60
Multiviewer...............................................................................................................................................................60
LED Information:......................................................................................................................................................61
Board Configuration:................................................................................................................................................61
3.5.3Memory Hole Activation ........................................................................................................61
REGIONAL CONTACTS................................................................................................. 63

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What’s New?
The following table describes the sections updated to reflect the new and updated
features on Multicam version 10.03.
In the user manual, the icon has been added on left margin to highlight
information on new and updated features.
Click the section number (or the description) in the table to jump directly to the
corresponding section.
Updated section for Multicam version 10.03
1.9.3 Update: Support of codec Apple ProRes 422 LT.
1.9.3 Possibility to perform the encoding process in 8-bit or 10
bit.

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1. Overview
Welcome in the EVS range of products and thank you for using an EVS XT[2]
server. We will do our best to satisfy your video production needs and we look
forward to continuing working with you.
The EVS XT[2] series servers are full digital in PAL (625i), NTSC (525i), 720p,
1080i and 1080p standards. These multi-channel, disk-based video servers are
ideal for a wide range of broadcast applications, from sports and live production to
playout and transmission.
1.1 XT[2] HIGH-RESOLUTION SERVER
The XT[2] server is typically used as a high-resolution server with various third
party controllers, applications and automation systems using industry-standard
protocols such as Sony BVW75, VDCP, Odetics, DD35, IPDP, or EVS’ AVSP,
EditRec, Linx API. XT[2] series servers can also be controlled by EVS
applications:
Live Slow Motion (LSM) for sports production, including replays, highlights
editing, and analysis tools like Split Screen to compare 2 synchronized actions
side by side, Target Tracking and Painting to highlight a particular detail or
provide tactical explanations
IPDirector: a suite of Windows software applications designed to manage
networked EVS video servers. Its applications make it possible to control multiple
channels within the XNet network, as well as to log an event, to create and
manage clips and play-lists with advanced functions, among others to extract clips
from a VTR It also provides extensive database search features.

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AirBox: a Windows GUI to manage clips and play-lists with various advanced
functions like loop playback, conditional transitions, etc.
1.2 XT[2] PROXY SERVER
From Multicam V10.01, a low-resolution option can be set up to use the XT[2]
server as a proxy server only. The Proxy servers can be run on large production
events as the counterparts of the high-resolution servers. In this case, they need
to be included in an XNet network distinct from the high-resolution XNet network.
The XT[2] proxy servers are used for browsing purposes and can be controlled by
IPDirector or EVS’ AVSP protocols.
1.3 UNPACKING
Upon receipt of the equipment examine packing for obvious signs of damage. If
damaged, do not unpack and inform the carrier immediately. Check thanks to the
included packing list if all the items are present and if they show any mechanical
damage. If yes, report damage or the missing parts to EVS or their appropriate
representative.
1.4 DIMENSIONS
1.4.1 VIDEO DISK RECORDER MAIN FRAME 19 INCHES
Rack mount 6U – Weight: 32.5 Kg/ 71.5 Lbs.
Rack mount 4U: Height: 170 mm
The following table specifies the various lengths:

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Cold swap (without redundant power supply)
Description Length (mm) Length (inch.)
Rackable length (from behind the rack
mounting stripes to the back of the server)
603 23,7
Length without the front panel 627 24,7
Length with the handles 660 26,0
Length with the front panel 670 26,4
Hot swap (with redundant power supply)
Description Length (mm) Length (inch.)
Rackable length (from behind the rack
mounting stripes to the back of the server)
640 25,2
Length without the front panel 662 26,1
Length with the handles 695 27,4
Length with the front panel 705 27,7
Hot swap power supplies sticks out by 25mm / 1’’ (H: 187mm / 7.2’ by W: 170mm /
6.65’)
Rack mounting stripes: L: 270 mm / 10.6” by W 21 mm / 0.8”
Handles: H: 55mm / 2.2” by L: 160 mm / 6.3” by W: 21 mm / 0.8”
1.4.2 XT-HDX
For more information on the XT-HDX, refer to section 3.4.3 “External RAID Array
XT-HDX for XT[2] Server”, on page 56.

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1.4.3 REMOTE CONTROL PANEL
Weight: 2.9 Kg / 6.3 Lbs.
1.4.4 10” TOUCH SCREEN VIDEO MONITOR
Weight: 3.6 Kg / 7.8 Lbs.
1.4.5 18” TOUCH SCREEN VIDEO MONITOR
Weight: 11.0 Kg / 23.9 Lbs.
1.4.6 KEYBOARD
Weight: 0.4 Kg / 0.9 Lbs.

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1.4.7 TABLET
Weight: 0.3 Kg / 6.6 Lbs. Ref: Wacom® CTF-430 Bamboo One
1.5 INSTALLATION
Before turning on the power, open the front door of Video disk recorder unit to
check if all boards fit into their guides. If a board is out of its guides, remove
carefully the board and replace it in the same slot.
1.6 SAFETY, COMPLIANCE AND OPERATING
CONDITIONS
1.6.1 SAFETY
This equipment has been designed and tested to meet the requirements of the
following:
EN 60950 European Safety of information technology equipment including
business equipment.
IEC 950 Interna-
tional
Safety of information technology equipment including
business equipment.
In addition, this equipment has been designed to meet the following:
UL 1950 - USA USA Safety of information technology equipment including
business equipment
1.6.2 EMC STANDARDS
EN 55022 European Emission Standard
EN 61000-3-2 European Electromagnetic Compatibility (EMC) Part 3 (Limits);
Section2 ; limits for harmonic current emissions
(equipment input current <16A per phase)
EN 61000-3-3 European European Electromagnetic Compatibility (EMC) Part
3 (Limits), Section 3; limitation of voltage fluctuation
and flicker in low-voltage supply systems for
equipment with rated current of 16 A.

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EN 55022 European Emission Standard
EN 61000-4-3 European European Electromagnetic Compatibility (EMC) Part
4 (Limits), Section 3; Testing and measurement
techniques - Radiated, radio-Frequency,
electromagnetic field immunity test.
EN 61000-4-4 European European Electromagnetic Compatibility (EMC) Part
4 (Limits), Section 4; Testing and measurement
techniques - Electrical fast transient/burst immunity
test.
EN 61000-4-5 European European Electromagnetic Compatibility (EMC) Part
4 (Limits), Section 5; Testing and measurement
techniques - Surge immunity test.
EN 61000-4-6 European European Electromagnetic Compatibility (EMC) Part
4 (Limits); Section 6 ; Testing and measurement
techniques - Immunity to conducted disturbances,
induced by radio-frequency fields.
EN 61000-4-7 European European Electromagnetic Compatibility (EMC) Part
4 (Limits), Section 7; harmonics and interharmonics
measurements and instrumentation, for power supply
systems and equipment connected thereto.
EN 61000-4-11 European European Electromagnetic Compatibility (EMC) Part
4 (Limits); Section 11 ; Voltage dips, short
interruptions and voltage variations immunity tests.
EN 50082-1 European European Generic Immunity Standard – Part 1:
Domestic, commercial and light industry
environment.
FCC USA Conducted and radiated emission limits for a Class A
digital device, pursuant to the Code of Federal
Regulations (CFR) Title 47 –
Telecommunications, Part 15: Radio Frequency
devices, subpart B-Unintentional Radiators.
1.6.3 EMC WARNING
Changes or modifications not expressly approved by the manufacturer for
compliance could void the user's authority to operate the equipment. This
equipment has been tested and found to comply with the limits for a Class B
digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to
provide reasonable protection against harmful interference in a residential
installation. This equipment generates uses and can radiate radio frequency
energy and, if not installed and used in accordance with the instructions, may
cause harmful interference to radio communications. However, there is no
guarantee that interference will not occur in a particular installation. If this
equipment does cause harmful interference to radio or television reception, which
can be determined by turning the equipment off and on, the user is encouraged to

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try to correct the interference by one or more of the following measures:
•Reorient or relocate the receiving antenna
•Increase the separation between the equipment and receiver
•Connect the equipment into an outlet on a circuit different from that to which the
receiver is connected
•Consult the dealer or an experienced radio/TV technician for help
1.6.4 CE MARKING
The CE marking is affixed to indicate compliance with the following directives:
•89/336//EEC of 3 May 1989 on the approximation of the laws of the Members
States to electromagnetic compatibility.
•73/23/EEC of 19 February 1973 on the harmonization of the laws of the
Members States relating to electrical equipment designed for use within certain
voltage limits.
•1999/5/EC of 9 March 1999 on radio equipment and telecommunications
terminal equipment and the mutual recognition of their conformity.
1.6.5 POWER SUPPLY
Important
The protective earth must be connected to the ground before powering
up the unit.
C OLD S WAP
This equipment is equipped with AUTOSWITCH power supply.
Connection to supply: Pluggable equipment Type A (EN60950 §1.2.5): Equipment
which is intended for connection to the building power supply wiring via a non-
industrial plug and socket-outlet or a non-industrial appliance coupler or both.
Correct mains polarity must always be observed. Do not use reversible power
plugs with this equipment.

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Class of equipment: Class 1 equipment (EN60950 § 1.2.5): electric shock
protection by basic insulation and protective earth.
Rated voltage: 110 to 240Vac (single phase)
Rated frequency: 50-60 Hz
Related Current: 10 A (100 to 120 Vac range) 5 A (220 to 240 Vac range)
Input connector: CEE22/IEC 320 3-pin male receptacle
Environmental Conditions
The equipment should be kept in the following environmental conditions:
Temperature: 0°C to +40°C (32°F to 104°F) ambient with free air flow
Relative humidity: 0% to 90% (non-condensing)
Cooling requirements: Forced air cooling air flow from front to back
Handling/movement: Designed for fixed use when in operation
Storage and transportation temperature: 0°C to +70°C (32°F to 158°F)
Storage and transportation relative humidity: 0% to 90% (non-condensing)
HOT SWAP
This equipment is equipped with AUTOSWITCH and hot-swappable power supply.
Connection to supply: Pluggable equipment Type A (EN60950 §1.2.5): Equipment
which is intended for connection to the building power supply wiring via a non-
industrial plug and socket-outlet or a non-industrial appliance coupler or both.
Correct mains polarity must always be observed. Do not use reversible power
plugs with this equipment.
Class of equipment: Class 1 equipment (EN60950 § 1.2.5): electric shock
protection by basic insulation and protective earth.
Rated voltage: 115 to 240Vac (single phase)
Rated frequency: 47-63 Hz
Related Current: 8 A (100 to 120 Vac range) 4 A (220 to 240 Vac range)
Input connector: CEE22/IEC 320 3-pin male receptacle
Environmental Conditions
Temperature: 0°C to + 50°C (32°F to 104°F) ambient with free air flow
Relative humidity: 0% to 90% (non-condensing)
Cooling requirements: Forced air cooling air flow from front to back
Handling/movement: Designed for fixed use when in operation
Storage and transportation temperature: 0°C to +70°C (32°F to 158°F)
Storage and transportation relative humidity: 0% to 90% (non-condensing)

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SECONDARY POWER SUPPLY
Cold Swap 2nd Power Supply
A 2nd power supply (cold swap) for the disk recorder unit is available optionally.
To connect this 2nd power supply in case of failure of the main one, remove the
metal plate in the top right corner of the back panel, and swap the large electrical
connector located inside this compartment.
This additional power supply should not be connected to mains when not in use.
Hot Swap 2nd Power Supply
A 2nd power supply (hot swap) for the disk recorder unit is available optionally.
This additional power supply should be connected to mains to allow automatic
power switching to the second power supply would the first one fail.
This additional power supply should be connected to mains to allow automatic
power switching to the second power supply would the first one fail.
GROUNDING
Ensure the disk recorder unit is properly grounded at all times to avoid electrical
shock hazard.
1.7 VENTILATION & RACK MOUNTING
Adequate ventilation is obviously required for optimum performance. As a result of
this consideration, ensure no other equipment is located close to the mainframe.
Important
•Remember that fans are used to air cool the equipment and protect it
from overheating.
•Do not block fans intakes during operations.
Having regard to the weight of the XT[2] chassis, support guides are required for
this unit into the rack mount. The front ears of the XT[2] unit are not designed to
support its full weight. Applying full weight on these might result in bending the
metal plate.

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1.8 HARDWARE CONSUMPTION
Hardware Description
Nominal
Current
Max. Current
Power
XT[2] 6U 6CH 5HDD COLD SWAP 0 NA 0
XT[2] 6U 6CH 10 HDD COLD SWAP 0 NA 0
XT[2] 6U 6CH NO DRIVE COLD
SWAP 0 NA 0
XT[2] 6U 4CH 5HDD COLD SWAP 1 NA 220
XT[2] 6U 2CH 5HDD COLD SWAP 0 NA 0
XT[2] 6U 6CH 5HDD HOT SWAP
ZIPPY 1,23 NA 270,6
XT[2] 6U 6CH 10 HDD HOT SWAP
ZIPPY 1,4 NA 308
XT[2] 6U 6CH NO DRIVE HOT
SWAP ZIPPY 0,84 NA 184,8
XT[2] 6U 4CH 5HDD HOT SWAP
ZIPPY 1,06 NA 233,2
XT[2] 6U 2CH 5HDD HOT SWAP
ZIPPY 0,94 NA 206,8
XT[2] 4U 4CH 5HDD COLD SWAP 0,92 NA 202,4

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1.9 XT[2] SERVER MAIN SPECIFICATIONS
1.9.1 VIDEO
XT[2] Server
Standard Definition High Definition
Video Formats 525i 59.94fps (NTSC)
625i 60fps (PAL)
720p 50/59.94fps
1080i 50/59.94fps
1080p 50/59.94fps (DualLink)
Digital Interface 10-bit 4:2:2 Serial
(SMPTE259M).
Full frame synchronizer at
input.
Dual output for PLAY
channels.
10-bit 4:2:2 Serial
(SMPTE292M).
Full frame synchronizer at
input.
Dual output for PLAY
channels.
Number of channels
(6RU rack)
2, 4 or 6 channels,
reversible REC/PLAY
2, 4 or 6 channels,
reversible REC/PLAY
Number of channels
(4RU rack)
2 or 4 channels,
reversible REC/PLAY
2 or 4 channels,
reversible REC/PLAY
Monitoring & Down-
converters
1 CVBS or SDI (software
select) per channel, with OSD
1 built-in down-converter per
channel, CVBS or SDI output
(software select) with OSD +
additional clean SDI output.
1 dedicated HD SDI output
with OSD per channel
Reference Analogue Black Burst Analogue Black Burst and HD
Tri-Level Sync
Graphics Board n.a. n.a.
1.9.2 AUDIO
•up to 8+8 analogue balanced input & output channels
•up to 16+16 (8 pairs + 8 pairs) AES/EBU or Dolby E input & output channels
•up to 64 channels embedded audio (16 audio per video)
•4 additional analogue balanced output channels for monitoring
•all audio connectors on mainframe

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Audio Processing
•uncompressed audio
•24 bit processing and storage
•sample rate converter from 25-55 kHz to 48KHz
•audio scrub
•audio mix
1.9.3 VIDEO CODECS &BITRATES
The EVS XT[2] server uses an intra-frame video encoding technique.
The XT[2] server supports natively the following video codecs:
Codec SD HD Code Protection
MJPEG √√No
DVCPro 50 √- Code 9
IMX √- No
Intra-frame MPEG-2 - √No
Avid DNxHD® - √Code 5
Apple ProRes 422 - √Code 6
Apple ProRes 422 HQ - √Code 6
Apple ProRes 422 LT - √Code 6
DVCPro HD - √Code 8
The target bitrate of the encoded video stream can be set by the user within the
accepted range: 8 to 100Mbps for standard definition, 40 to 250Mbps for high
definition with the exception of Apple ProRes, Avid DNxHD® and DVCPro codecs
working with defined bitrates.
The default values are MJPEG 30Mbps for standard definition and MJPEG
100Mbps for high definition.
The code-protected codecs are solely available when the corresponding code is
valid.
Up to Multicam 10.01, all codecs used in the EVS Video servers were encoding in
8-bit. From Multicam 10.03, it is possible to perform the encoding process in 8-bit
or 10 bit and to write a 10-bit file on selected codecs.

XT Series DISK RECORDER - Version 10.03 - Hardware
Technical Reference Manual
Issue
10.03.B
EVS Broadcast Equipment SA
–
July 2010
13
The following table summarizes the proposed configurations in the XS:
Encoding File Header
DNxHD 120/145 8-bit 8-bit
DNxHD 185/220 8-bit 8-bit
DNxHD 185x
DNxHD 220x 10-bit 10-bit
ProRes 120/145 8-bit 10-bit
ProRes 185/220 8-bit or 10-bit 10-bit
DVCPro HD 8-bit 8-bit
M-JPEG 8-bit 8-bit
MPEG 8-bit 8-bit
Note
When encoding in 10-bit, it is not possible to use the graphic
functionality: Paint, Target, Logo Insertion and manual offside line.
1.9.4 RECORDING CAPACITY FOR XT[2] SERVERS
The following tables show the recording capacity, in hours, for 1 record channel
(i.e. 1 video + 4 stereo audio tracks in SD ; 1 video + 8 stereo audio tracks in HD)
with arrays of 73GB, 146GB or 300GB disks compared with the different video
bitrates & codecs. These tables are valid with the “Operational Disk Size”
parameter set to 100%.
The different drive arrangements are:
•Internal/External module (4 + 1) x 73 GB drives (total 292 GB usable)
•Internal/External module (4 + 1) x 146 GB drives (total 584 GB usable)
•Internal/External module (4 + 1) x 300 GB drives (total 1200 GB usable)
•Internal/External module (8 + 2) x 300 GB drives (total 2400 GB usable)
•External module (12 + 3) x 300 GB drives (total 3600 GB usable)