Recording And Interface Technology; Physical Characteristics; Seek Time - Seagate ST38421A - U4 8.4 GB Hard Drive Product Manual

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1.3 Recording and interface technology

Interface
Recording method
Recording density BPI (bits/inch)
Track density TPI (tracks/inch)
Areal density (Mbits/inch
Spindle speed (RPM) ( 0.2%)
Internal data-transfer rate
(Mbits/sec max)
I/O data-transfer rate
(Mbytes /sec max)
Interleave
Cache buffer (Kbytes)

1.4 Physical characteristics

Drive Specification
Maximum height (mm)
(inches)
Maximum width (mm)
(inches)
Maximum length (mm)
(inches)
Typical weight (grams)
(pounds)

1.5 Seek time

Seek measurements are taken with nominal power at 25°C ambient
temperature. All times are measured using drive diagnostics. The spec-
ifications in the table below are defined as follows:
•
Track-to-track seek time is an average of all possible single-track
seeks in both directions.
U4 Family Product Manual, Rev. D
ATA
16/17 EPRML
241,000
13,100
2
max) 3,179
5,400
206
16.6 (PIO mode 4)
66.6 (Ultra DMA mode 4)
1:1
256
ST38421A, ST36421A,
ST34311A, ST32112A
26.1
1.028
101.8
4.020
147.0
5.78
580
1.2