Seagate ST38421A Product Manual - Page 14

Recording and interface technology, Physical characteristics, Seek time

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6 U4 Family Product Manual, Rev. D 1.3 Recording and interface technology Interface ATA Recording method 16/17 EPRML Recording density BPI (bits/inch) 241,000 Track density TPI (tracks/inch) Areal density (Mbits/inch2 max) 13,100 3,179 Spindle speed (RPM) (± 0.2%) 5,400 Internal data-transfer rate (Mbits/sec max) 206 I/O data-transfer rate (Mbytes /sec max) 16.6 (PIO mode 4) 66.6 (Ultra DMA mode 4) Interleave 1:1 Cache buffer (Kbytes) 256 1.4 Physical characteristics Drive Specification ST38421A, ST36421A, ST34311A, ST32112A Maximum height (mm) (inches) 26.1 1.028 Maximum width (mm) (inches) 101.8 4.020 Maximum length (mm) (inches) 147.0 5.78 Typical weight (grams) 580 (pounds) 1.2 1.5 Seek time Seek measurements are taken with nominal power at 25°C ambient temperature. All times are measured using drive diagnostics. The specifications 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.

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6
U4 Family Product Manual, Rev. D
1.3
Recording and interface technology
1.4
Physical characteristics
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.
Interface
ATA
Recording method
16/17 EPRML
Recording density BPI (bits/inch)
241,000
Track density TPI (tracks/inch)
13,100
Areal density (Mbits/inch
2
max)
3,179
Spindle speed (RPM) (
±
0.2%)
5,400
Internal data-transfer rate
(Mbits/sec max)
206
I/O data-transfer rate
(Mbytes /sec max)
16.6 (PIO mode 4)
66.6 (Ultra DMA mode 4)
Interleave
1:1
Cache buffer (Kbytes)
256
Drive Specification
ST38421A, ST36421A,
ST34311A, ST32112A
Maximum height
(mm)
(inches)
26.1
1.028
Maximum width
(mm)
(inches)
101.8
4.020
Maximum length
(mm)
(inches)
147.0
5.78
Typical weight
(grams)
(pounds)
580
1.2