Product manual

14 Barracuda 2LP Product Manual, Rev. D
5.3 General performance characteristics
Minimum sector interleave 1 to 1
Data buffer to/from disc media 512-byte sector
Data transfer rate (≤ 1 sector)
Minimum 5.30 Mbytes/sec*
Maximum 8.94 Mbytes/sec*
Data transfer rate (< 1 track)
Minimum 3.56 Mbytes/sec*
Maximum 7.65 Mbytes/sec*
SCSI interface data
Asynchronous transfer rate * 5.0 Mbytes/sec**
(maximum instantaneous) 10.0 Mbytes/sec***
Synchronous transfer rate fast 2.5 to 10 Mbytes/sec
(ST31250N/ND and ST32550N/ND)
Synchronous transfer rate wide 5.0 to 20 Mbytes/sec
(ST31250W/WD/WC/DC and
ST32550W/WD/WC/DC)
Sector sizes
Default 512-byte data blocks
Variable in even-sector sizes 180 to 4,096 bytes
Read/write consecutive sectors on a track Yes
Flaw reallocation performance impact
Spare sectors per track reallocation Negligible
Spare sectors per cylinder reallocation Negligible
Spare tracks per volume reallocation 35 msec (typical)
Overhead time for head switch 0.7 msec
Overhead time for one-track cylinder switch 1.6 msec (typical)
Average rotational latency 4.17 msec
* Rate measured from the start of the first sector transfer to or from the host.
** Assumes system ability to suppo rt 5.0 Mtransfers/sec, 1 byte wide, and
no cable loss.
*** Assumes system ability to support 5.0 Mtransfers/sec, 2 bytes wide, and
no cable loss.