Acer 2500 manual CD-ROM Interface, 2MB, Items Specification, QSI SCR242, Qsi

Hard Disk Drive Interface

Item
Bytes per sector	512	512	512
Logical heads	16	16	16
Logical sectors	63	63	63
Drive Format
Logical cylinders	16383	16383	16383
Physical read/write	2/Not show/2	2/Not show/2/2	3/
heads
Disks	1/Not show/1	1/Not show/1/1	2
Spindle speed (RPM)	4200RPM	4200RPM	4200RPM
Performance Specifications
Buffer size	2MB	2MB/8MB for Toshiba	2MB
Interface	ATA-5 for other vendors /ATA-	ATA-5 for other vendors /ATA-	ATA-5 for other vendors /ATA-
	6 for HGST and Toshiba	6 for HGST	6 for HGST
Data transfer rate	350	350	350
(disk-buffer, Mbytes/
s)
Data transfer, rate	100 MB/Sec	100 MB/Sec	100MB/Sec
(host~buffer, Mbytes/
s)
DC Power Requirements
Voltage tolerance	5 +/- 5%	5 +/- 5%

CD-ROM Interface

Items	Specification
Vendor & Model Name	QSI SCR242
	Mitsumi SR244W1
Performance Specification
Brust Data Transfer rate	PIO mode 4:
	16.7 MB/sec Max. (Mode 0~4)
	Multi-word DMA mode 2:
	16.7 MB/sec Max. (Mode 0~2)
	Ultra DMA mode 2:
	33.3MB/sec Max.
Access time (typ.)	QSI-
	Random: 90 ms
	Full Stroke: 180 ms
	Mitsumi-
	Random: 100 ms
	Full Stroke: 240 ms
Rotation speed	5100 rpm for QSI
	5400 rpm for Mitsumi 24X CAV mode
Data Buffer Capacity	128 KB (built-in)
Interface	Compliant to ATA/ATAPI-6

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