Compaq manual 150

System DMA

Hard Drives

Models		DBCA-20648		DBCA-206480		DCXA-21000
Capacity Per Drive		4.8-GB		6.4-GB		10.0-GB
Drive Type		U-DMA/33		U-DMA/33		U-DMA/33
Logical Configuration
Cylinders		10068		13424		16383
Heads		3		4		6
Sectors per Track		63		63		63
Bytes per Sector		512		512		512
Seek Times
(Typical, including settling in ms)		Read	13ms	Read	13ms	Read	12ms
		Write	14ms	Write	14ms	Write	14ms
Single Track
		Read	2.5ms	Read	2.5ms	Read	2.5ms
Full Stroke		Write	3.0ms	Write	3.0ms	Write	3.0ms
		Read	23ms	Read	23ms	Read	23ms
		Write	24ms	Write	24ms	Write	24ms
Transfer Rate		16.6MB/s		16.6MB/s		16.6MB/s
At interface
	Hard Drives, continued
Models		MHH20 48AT		MHH20 64AT		MHG2 102AT
Capacity Per Drive		4.8-GB		6.4-GB		10.0-GB
Drive Type		U-DMA/33		U-DMA/33		U-DMA/33
Logical Configuration
Cylinders		Not Available		13424		16383
Heads		Not Available		4		6
Sectors per Track		Not Available		63		63
Bytes per Sector		Not Available		512		512
Seek Times
(Typical, including settling in ms)		Read	N/A	Read	13ms	Read	13ms
		Write	N/A	Write	14ms	Write	N/A
Single Track
		Read	N/A	Read	2.5ms	Read	1.5ms
Full Stroke		Write	N/A	Write	3.0ms	Write	N/A
		Read	N/A	Read	23ms	Read	23ms
		Write	N/A	Write	24ms	Write	N/A
Transfer Rate		15.8MB/s		16.6MB/s		15.8MB/s
At interface
	Hard Drives, continued
Models		DK238 A-43		DK228 A-65		DK239 A-65
Capacity Per Drive		4.3-GB		6.4-GB (12.7mm)		6.4-GB
Drive Type						U-DMA/33
Logical Configuration
Cylinders		Not Available		13424		16383
Heads		Not Available		4		6
Sectors per Track		Not Available		63		63
Bytes per Sector		Not Available		512		512

file:///C/SERVICE%20MANUALS/COMPAQ%20_%20check...1915%201919%201920%201922%201925/Specific2.html (4 of 5)6/27/2004 5:05:48 AM