Seagate 810 manual Recording and interface technology, Physical dimensions

6Marathon 810 (ST9816AG) Product Manual, August 1995

1.3 Recording and interface technology

Interface	ATA
Recording method	RLL (1,7)
Recording density (bits/inch)	90,000
Flux density (flux change/inch)	67,500
Track density (tracks/inch)	3,807
Areal density (Mbits/inch2)	342
Spindle speed (RPM)	4,500
( ± 0.5%)
Internal data-transfer rate	44
(Mbits per sec max—ZBR)
I/O data-transfer rate	16.6 (PIO mode 4 with IORDY)
(Mbytes per sec max)	16.6 (multiword DMA mode 2)
Interleave	1:1
Cache buffer (Kbytes)	120

1.4 Physical dimensions

Height (max) inches	0.754
(mm)	(19.15)
Width (max) inches	2.76
(mm)	(70.10)
Depth (max) inches	4.010
(mm)	(101.85)
Weight (typical) ounces	7.4
(kg)	(0.21)

Note. Maximum depth excludes I/O connector pins, which may extend up to 0.010 inches beyond the edge of the head/disc assembly.