Seagate ST39205LW/LC, ST318405LW/LC, ST336705LW/LC manual Performance characteristics

Cheetah 36XL Product Manual, Rev. E 9

4.0Performance characteristics

4.1Internal drive characteristics (transparent to user)

	ST336705	ST318405	ST39205
Drive capacity	36.704	18.352	9.176	GByte (formatted, rounded off values)
Read/write heads	8	4	2
Bytes/track	241,128	241,128	241,128	Bytes (average, rounded off values)
Bytes/surface	4,577.5	4,577.5	4,577.5	Mbytes (unformatted, rounded off values)
Tracks/surface (total)	19,036	19,036	19,036	Tracks (user accessible)
Tracks/inch	24,406	24,406	24,406	TPI
Peak bits/inch	381.28	381.28	381.28	KBPI
Internal data rate	320-490	320-490	320-490	Mbits/sec (variable with zone)
Disc rotational speed	10,022	10,022	10,022	r/min (+0.5%)
Average rotational latency	2.99	2.99	2.99	msec

4.2SCSI performance characteristics (visible to user)

The values given in Section 4.2.1 apply to all models of the Cheetah 36XL family unless otherwise specified. Refer to Section 9.10 and to the SCSI Interface Product Manual, part number 75789509, for additional timing details.

4.2.1Access time [5]

	Including controller overhead		Not including controller overhead
	(without disconnect) [1] [3]		(without disconnect) [1] [3]
	Drive level		Drive level
	Read	Write	Read	Write
	msec			msec
Average—Typical [2]	5.6	6.4	5.4	6.2
Single Track—Typical [2]	1.0	1.4	0.8	1.2
Full Stroke—Typical [2]	10.7	11.2	10.5	11

4.2.2Format command execution time (minutes) [1]

	ST336705	ST318405	ST39205
Maximum (with verify)	36	18	9
Maximum (no verify)	19	9.5	4.5

4.2.3Generalized performance characteristics

Minimum sector interleave 1 to 1

Data buffer transfer rate to/from disc media (one contiguous 512-byte sector):

Minimum [3]	31 MByte/sec
Average [3]	43 MByte/sec
Maximum [3]	50 MByte/sec

Data buffer transfer rate to/from disc media (<1 track)

Minimum [3]	29 MByte/sec
Average [3]	40 MByte/sec
Maximum [3]	46 MByte/sec