HP 6640C (US/CAN), 6744 (US), 6730 (US/CAN), 6657 (LA), 6649F (US/CAN) Specification summary table

2

U10 Family Product Manual, Rev. A

Drive Specification

ST320423A

ST315323A

ST310212A

Guaranteed Mbytes (×106 bytes)

20,485

15,364

10,242

Guaranteed sectors

40,011,300

30,008,475

20,005,650

Bytes per sector

512

Default sectors per track

63

Default read/write heads

16

16

16

Default cylinders

16,383

16,383

16,383

Physical read/write heads

4

3

2

Discs

2

2

1

Recording density

BPI (bits/inch max)

396,067

Track density

TPI (tracks/inch)

20,107

Areal density

(Mbits/inch2 max)

7,964

Spindle speed (RPM)

5,400

Internal data-transfer rate (Mbits/

sec max)

308

I/O data-transfer rate (Mbytes/

sec max)

66.6

ATA data-transfer modes

PIO modes 0–4

supported

Multiword DMA modes 0–2

Ultra DMA modes 0–4

Cache buffer (Kbytes)

512

Height (mm max)

26.1

Width (mm max)

101.85

Length (mm max)

147.0

Weight (typical)

544 grams (1.2 lb)

Track-to-track seek time

(msec typical)

1.5 (read) 2.1 (write)

Average seek time (msec typical)

8.9