Acer 250 manual Hard Disk Drive Interface, CD-ROM Interface, Items Specification

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Hard Disk Drive Interface

Item	Specification
Vendor & Model	HITACHI	HITACHI DK23EA-30	HITACHI DK23EA-40	HITACHI DK23EA-60
Name	EUCALYPTUS	HGST MORAGA	HGST MORAGA	HGST MORAGA
	DK23EA-20/	IC25N030ATMR04-0	IC25N040ATMR04-0	IC25N060ATMR04-0
	HGST MORAGA	TOSHIBA NEPTUNE		TOSHIBA NEPTUNE
	IC25N020ATMR04-0	MK3021GAS		MK6021GAS
	08K0632
	IBM CASCADE
	IC25N020ATCS04-0
	07N8325
Capacity (MB)	20000	30000	40000	60000
Bytes per sector	512	512	512	512
Logical heads	16	16	16	16
Logical sectors	63	63	63	63
Drive Format
Logical cylinders	42091/16383/16383	42091/16383/47080	42091/16383	42091/16383/47080
Physical read/write	2/1/2	3/2/2	2/2	4/3/4
heads
Disks	1/1/1	2/1/1	1/1	2/2/2
Spindle speed (RPM)	4200RPM
Performance Specifications
Buffer size	2MB	2MB	2MB	2MB
Interface	ATA-5 for other vendors /ATA-6 for HGST
Data transfer rate	19.4-37.1/350/245	22.1-42.8 for Hitachi/	19.4-37.1 for Hitachi/	22.1-42.8 for Hitachi/
(disk-buffer, Mbytes/		350 for HGST	350 for HGST	350 for HGST
s)
Data transfer, rate	100 MB/Sec
(host~buffer, Mbytes/
s)
DC Power Requirements
Voltage tolerance	5 +/- 5%

CD-ROM Interface

Items	Specification
Vendor & Model Name	Mitsumi SR-244W1
Performance Specification
Transfer rate	Read Sustained:
	1545~3600 KB/sec
	Programmed I/O:
	16.7 MB/sec Max. (Mode 0~4)
	Multi-word DMA:
	16.7 MB/sec Max. (Mode 0~2)
	Ultra DMA:
	33.3MB/sec Max.
Access time (typ.)	Random: 115 ms
	Full Stroke: 250 ms
Rotation speed	5136 rpm
Data Buffer Capacity	128 KB

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