Transcend 1.8" StoreJet Portable HDD 20GB (TOSHIBA)... User manual

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Transcend Information Inc.
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Description
TS20GSJ18 is a USB 2.0 20GB Portable Hard Disk.
This device is a 20GB TOSHIBA 1.8” hard disk drive
(HDD) installed in a Portable Hard Disk Enclosure. It is
designed to expedite exchanging huge amounts of data
between this device and any desktop or notebook
computers.
Outline
B
A
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® ® ™
System Requirements
•Desktop or notebook computers with USB port
•One of following operating systems:
Win
®
98, Win
®
Me, Win 2000, Win XP, Mac OS
Features
•100% Compatible with USB Interface in Windows or Mac
•USB connection for true Plug and Play
•Single Power Supply: 5V ±10%
•Connector Durability: 5000 times
•Recommended operating temperature : 5℃– 60 ℃
•Supports Resume Suspend and Low power modes
•Compliant with USB specification version 1.1 & 2.0
•Support 1.8” hard disk drive. (TOSHIBA)
•LEDs indicate Power On and Data Traffic
Dimensions
Side Millimeters Inches
A 95.00 ±1.00 37.40 ±0.04
B 71.50 ±1.00 28.15 ±0.04
C 15.00 ±1.00 5.90 ±0.04

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1.8” StoreJet Portable HDD 20GB (TOSHIBA)
Transcend Information Inc.
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Block Diagram
Pinouts
Pin No. Pin Name
01 VCC
02
Control signal
USB IDE
Interface
Controller
USB Connector
D0~D15
/WE
/RE
HDD
...
USB-
USB+
D0~D15
Crystal
12MHz
LED
Control line
CLK
USB-
03 USB+
04 VSS
Pin Identification
Symbol Function
USB-
USB+
USB differential signal:
The pairs are used to transmit
Data/Address/Command
VSS Ground
VCC USB power input

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1.8” StoreJet Portable HDD 20GB (TOSHIBA)
Transcend Information Inc.
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Specification
Size L x W x H 95mm x 71.5mm x 15mm
Weight 118 g
Temperature Operating 5℃– 60 ℃
Shock resistant Operating 250G
Non-Operating 1000G
Capacity 20 GBytes
Sustained transfer rate Read 16.6 MB/sec
Write 16.4 MB/sec
Bus transfer rate USB 2.0 Full Speed 480 Mb/sec
Certificate CE, FCC, BSMI
Electrical DC Characteristics (Ta=0°C to 70°C, Vcc=3.3V±10%)
AC Characteristics

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1.8” StoreJet Portable HDD 20GB (TOSHIBA)
Transcend Information Inc.
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Hard Drive Basic Specifications:
Principal Specification
MODEL MK2004GAL
Formatted Capacity (gigabytes) 20.000
Servo design method Sector Servo
Recording method 32/34 TC-EEPR4+PP
Recording density
Track / mm (TPI) 3465 (88.0k)
Bit / mm (BPI) 27.4k (695k) max.
Flux change / mm (FRPI) 29.1k (738k) max
Number of disks 1
Number of data heads 2
Number of user data cylinders 38,160
Bytes per sector 512
Performance
<*1> Under the condition of normal voltage, 25
o
C normal temperature and bottom side down.
<*2> Average time to seek all possible adjacent track without head switching.
<*3> Weighted average time to travel between all possible combination of track calculated as below.
Weighted average access time = [ Sum of P(n)*t(n) ] / [ Sum of P(n) ], n = 1 to N.
Where, N; Total number of tracks.
P(n); Total number of seek for stroke n [ = 2*(N - n) ].
t(n); Average seek time for stroke n.
Average seek time to seek to stroke n is the average time to 1,000 seeks for stroke n, with random head

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1.8” StoreJet Portable HDD 20GB (TOSHIBA)
Transcend Information Inc.
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<*4> Average time for 1,000 full stroke seeks with random head switches.
<*5> Typical values are for the condition of normal voltage, 25
o
C normal temperature and placing bottom side down.
Maximum values are for all conditions specified in this document.
Supply Voltage
Power Consumption
Average (note1)
MK2004GAL
Start 1.2 W Maximum
Seek (note2) 1.4 W Typical
Read / Write (note3) 1.4 W Typical
Active idle (node4) 0.6 W Typical
Low power idle (note5) 0.4 W Typical
Stand-by (note6) 0.2 W Typical
Sleep 0.08 W Typical
(note 1) Under normal condition (25
o
C, 101.3 kPa (1,013 mb)) and 3.3V ±0%.
(note 2) The seek average current is specified based on three operations per 100 ms.
(note 3) The read/write current is specified based on three operations of 63 sector read/write per 100 ms.
(note 4) Motor is rotating at normal speed but none of Read, Write or Seek is executed.
(note 5) Motor is rotating at normal speed but heads are unloaded on the ramp.
(note 6) Motor is not rotating and heads are unloaded on the ramp.
Temperature and Humidity

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Transcend Information Inc.
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Shock
Acoustics (Sound Power)
MK2004GAL
22dB For idle mode (Spindle in rotating).
26dB
Randomly select a track to be sought in such a way
that every track has equal probability of being selected.
Seek rate(ns) is defined by the following formura:
ns = 0.4 / ( tT = tL )
tT is published time to seek from one random track to
another without including rotational latency;
tL is the time for the drive to ratate by half a revolution.
Mean Time to Failure (MTTF)
Above technical information is based on industry standard data and tested to be reliable. However, Transcend makes
no warranty, either expressed or implied, as to its accuracy and assumes no liability in connection with the use of this
product. Transcend reserves the right to make changes in specifications at any time without prior notice.