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

 

 

Chapter 1

21

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