Transcend Information Personal Computer TS20GSJ18 User Manual

TS20GSJ18  
1.8” StoreJet Portable HDD 20GB (TOSHIBA)  
Description  
System Requirements  
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.  
Desktop or notebook computers with USB port  
One of following operating systems:  
Win® 98, Win® Me, Win® 2000, Win® XP, MacOS  
Features  
100% Compatible with USB Interface in Windows or Mac  
USB connection for true Plug and Play  
Single Power Supply: 5V ± 10%  
Outline  
B
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  
A
Dimensions  
Side  
A
Millimeters  
95.00 ± 1.00  
71.50 ± 1.00  
15.00 ± 1.00  
Inches  
37.40 ± 0.04  
28.15 ± 0.04  
5.90 ± 0.04  
B
C
C
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Transcend Information Inc.  
 
TS20GSJ18  
1.8” StoreJet Portable HDD 20GB (TOSHIBA)  
Specification  
Size  
L x W x H  
95mm x 71.5mm x 15mm  
118 g  
Weight  
Temperature  
Shock resistant  
Operating  
5– 60 ℃  
250G  
Operating  
Non-Operating  
1000G  
Capacity  
Sustained transfer rate  
20 GBytes  
16.6 MB/sec  
16.4 MB/sec  
480 Mb/sec  
CE, FCC, BSMI  
Read  
Write  
USB 2.0 Full Speed  
Bus transfer rate  
Certificate  
Electrical DC Characteristics (Ta=0°C to 70°C, Vcc=3.3V±10%)  
AC Characteristics  
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Transcend Information Inc.  
 
TS20GSJ18  
1.8” StoreJet Portable HDD 20GB (TOSHIBA)  
Hard Drive Basic Specifications:  
Principal Specification  
MODEL  
MK2004GAL  
Formatted Capacity (gigabytes)  
Servo design method  
Recording method  
Recording density  
20.000  
Sector Servo  
32/34 TC-EEPR4+PP  
Track / mm (TPI)  
3465 (88.0k)  
Bit / mm (BPI)  
27.4k (695k) max.  
Flux change / mm (FRPI)  
Number of disks  
Number of data heads  
Number of user data cylinders  
Bytes per sector  
29.1k (738k) max  
1
2
38,160  
512  
Performance  
<*1> Under the condition of normal voltage, 25oC 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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Transcend Information Inc.  
 
TS20GSJ18  
1.8” StoreJet Portable HDD 20GB (TOSHIBA)  
<*4> Average time for 1,000 full stroke seeks with random head switches.  
<*5> Typical values are for the condition of normal voltage, 25oC 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  
Seek (note2)  
1.2 W Maximum  
1.4 W Typical  
1.4 W Typical  
0.6 W Typical  
0.4 W Typical  
0.2 W Typical  
0.08 W Typical  
Read / Write (note3)  
Active idle (node4)  
Low power idle (note5)  
Stand-by (note6)  
Sleep  
(note 1) Under normal condition (25oC, 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  
5
Transcend Information Inc.  
 
TS20GSJ18  
1.8” StoreJet Portable HDD 20GB (TOSHIBA)  
Shock  
Acoustics (Sound Power)  
MK2004GAL  
22dB  
For idle mode (Spindle in rotating).  
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 )  
26dB  
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.  
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Transcend Information Inc.  
 

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