10
Barracuda 9 Product Manual, Rev. C
SCSI interface data transfer rate (asynchronous) [4]:
Maximum instantaneous
5.0 Mbytes/sec [5]
Maximum average
10.0 Mbytes/sec [6]
Synchronous transfer rate for SCSI Fast-20 (Ultra SCSI)
2.5 to 20 Mbytes/sec
(8 bit data bus models)
Synchronous transfer rate for SCSI Fast-20 (Ultra SCSI)
5.0 to 40 Mbytes/sec
(16 bit data bus models)
Synchronous transfer rate for fast SCSI-2
1.25 to 10 Mbytes/sec
(8 bit data bus models)
Synchronous transfer rate for fast SCSI-2
2.5 to 20 Mbytes/sec
(16 bit data bus models)
Sector sizes:
Default
512-byte data blocks
Variable in even-sector sizes
180 to 4,096 bytes per sector
Read/write consecutive sectors on a track
Yes
Flaw reallocation performance impact (for flaws
reallocated at format time using the spare tracks per
volume reallocation scheme)
35 msec (typical)
Overhead time for head switch (512-byte sectors)
in sequential mode
0.8 msec
Overhead time for one track cylinder switch
in sequential mode
1.2 msec (typical)
Average rotational latency
4.17 msec
Notes for Sections 4.2.
[1]
Execution time is measured from receipt of the last byte of the Command Descriptor Block (CDB) to the
request for a status byte transfer to the initiator (excluding connect/disconnect).
[2]
Typical access times are measured under nominal conditions of temperature, voltage, and horizontal ori-
entation as measured on a representative sample of drives. These access times do not include average
rotational latency time.
[3]
Assumes no errors and no sector reallocations.
[4]
Rate measured from the start of the first sector transfer to or from the host.
[5]
Assumes system ability to support the rates listed 1 byte wide and no cable loss.
[6]
Assumes system ability to support the rates listed 2 bytes wide and no cable loss.
[7]
Access time = controller ov average seek time.
Access data time = controller ov average seek time + latency.
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