HP 6642D (US) Specification summary table, Drive Specification, ST317221A, ST313021A, ST38410A

2 U8 Family Product Manual, Rev. B

Specification summary table

The specifications listed in this table are for quick reference. For details on specification measurement or definition, see the appropriate section of this manual.

Drive Specification	ST317221A	ST313021A	ST38410A	ST34313A
Guaranteed Mbytes (×106 bytes)	17,245	13,022	8,622	4,327
Guaranteed sectors	33,683,328	25,434,228	16,841,664	8,452,080
Bytes per sector		512
Default sectors per track		63
Default read/write heads	16	16	16	15
Default cylinders	16,383	16,383	16,383	8,944
Physical read/write heads	4	3	2	1
Discs	2	2	1	1
Recording density
BPI (bits/inch max)		349,374
Track density
TPI (tracks/inch)		18,700
Areal density
(Mbits/inch2 max)		6,536
Spindle speed (RPM)		5,400
Internal data-transfer rate (Mbits/
sec max)		285.5
I/O data-transfer rate (Mbytes/
sec max)		66.6
ATA data-transfer modes		PIO modes 0–4
supported		Multiword DMA modes 0–2
		Ultra DMA modes 0–4
Cache buffer (Kbytes)		512
	256-Kbyte cache is optional for the ST34313A
Height (mm max)		26.1
Width (mm max)		102
Length (mm max)		147.0
Weight (typical)		590 grams (1.3 lb)
Track-to-track seek time
(msec typical)		1.5 (read) 2.1 (write)
Average seek time (msec typical)		8.9