Start/Stop Time - Seagate ST39173N Product Manual

10
SCSI interface data transfer rate (asynchronous) [5]:
Maximum instantaneous
Maximum average
Synchronous transfer rate for SCSI Fast-20 (Ultra-1 SCSI):
8 bit data bus models
16 bit data bus models
Synchronous transfer rate for SCSI Fast-40 (Ultra-2 SCSI):
8 bit data bus models
16 bit data bus models
Synchronous transfer rate for fast SCSI-2:
8 bit data bus models
Synchronous transfer rate for fast SCSI-2:
16 bit data bus models
Sector Sizes:
Default
Variable
Read/write consecutive sectors on a track
Flaw reallocation performance impact (for flaws reallocated at format time using
the spare sectors per sparing region reallocation scheme.)
Overhead time for head switch (512 byte sectors) in sequential mode
Overhead time for one track cylinder switch in sequential mode
Average rotational latency
Notes for Section 4.2.
[1] Execution time 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] Maximum times are specified over the worst case conditions of temperature, voltage margins and drive
orientation. When comparing specified access times, care should be taken to distinguish between typical
access times and maximum access times. The best comparison is obtained by system benchmark tests
conducted under identical conditions. Maximum times do not include error recovery.
[3] Typical Access times are measured under nominal conditions of temperature, voltage, and horizontal ori-
entation as measured on a representative sample of drives.
[4] Assumes no errors and no sector has been relocated.
[5] Rate measured from the start of the first sector transfer to or from the Host.
[6] Assumes system ability to support the rates listed and no cable loss.
[7] Simulated.
[8] Access time = controller overhead + average seek time
Access to data = controller overhead + average seek time + latency time
4.3

Start/stop time

After DC power at nominal voltage has been applied, the drive typically becomes ready within 30 seconds if the
Motor Start Option is disabled, such as the motor starts as soon as the power has been applied. If a recover-
able error condition is detected during the start sequence, the drive executes a recovery procedure which may
cause the time to become ready to exceed 30 seconds, but to become ready within 50 seconds. During spin up
to ready time, the drive responds to some commands over the SCSI interface in less than 1.5 seconds after
application of power. The supported commands include the Test Unit Ready command which can be used to
Barracuda 9LP Product Manual, Rev. C
6.0 Mbytes/sec [6]
6.0 Mbytes/sec [7]
20 Mbytes/sec
40 Mbytes/sec
40 Mbytes/sec
80 Mbytes/sec
1.25 to 10 Mbytes/sec
2.5 to 20 Mbytes/sec
512 byte user data blocks
180 to 4,096 bytes per sector in even number of
bytes per sector.
If n (number of bytes per sector) is odd, then n-1
will be used.
Yes
Negligible
1.2 msec
1.2 msec (typical)
4.17 msec