Transcend Information 1.8" StoreJet Portable HDD 20GB (TOSHIBA) TS20GSJ18 - Manual (Page 4)

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1.8” StoreJet Portable HDD 20GB (TOSHIBA)
Transcend Information Inc. 4
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