LD25 Series PATA Product Manual, Rev. C
2.2 Formatted capacity
*One Gbyte equals one billion bytes when referring to hard drive capacity. Accessible capacity may vary depending on operating environ-
ment and formatting.
2.3 Default logical geometry
LBA mode
When addressing these drives in LBA mode, all blocks (sectors) are consecutively numbered from 0 to n–1,
where n is the number of guaranteed sectors as defined above.
2.4 Physical organization
2.5 Recording and interface technology
Model Formatted capacity* Guaranteed sectors Bytes per sector
ST9402115A 40 Gbytes 82,443,600 512
ST920217A 20 Gbytes 41,021,800 512
Cylinders Read/write heads Sectors per track
16,383 16 63
Model Read/write heads Number of discs
ST9402115A 2 1
ST920217A 1 1
Interface Parallel ATA
Recording density BPI (bits/inch typical) 675,900
Track density TPI (tracks/inch typical) 114,000
Areal density (Gbits/inch
2
max) 81
Spindle speed (RPM) (± 0.2%) 5,400
Internal data-transfer rate OD (Mbytes/sec max) 57.6
I/O data-transfer rate (Mbytes/sec max) 100 (Ultra DMA mode 5)
Interleave 1:1
Cache buffer 2 Mbytes (2,048 kbytes)
