6 Barracuda ATA IV Family Product Manual, Rev. B
1.2 Physical organization
1.3 Recording and interface technology
Drive model Read/write heads Number of discs
ST380021A 4 2
ST360021A 3 2
ST340016A 2 1
ST320011A 1 1
Interface ATA
Recording method 16/17 EPRML
Recording density BPI (bits/inch max) 540,000
Track density TPI (tracks/inch max) 58,000
Areal density (Mbits/inch
2
max) 31,300
Spindle speed (RPM) (
±
0.2%) 7,200
Internal data-transfer rate OD
(Mbits/sec max) 555
I/O data-transfer rate
(Mbytes/sec max)
16.6 (PIO mode 4)
100 (Ultra DMA mode 5)
Interleave 1:1
Cache buffer 2 Mbytes
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