Seagate Savvio 10K Manual download pdf (Page 18)

Savvio SCSI Product Manual, Rev. D

4.2.3 Generalized performance characteristics

Data buffer transfer rate to/from disc media (one 512-byte sector):

SCSI interface data transfer rate (asynchronous):

Maximum instantaneous one byte wide 5.0 Mbytes/sec [4]

Maximum instantaneous two bytes wide 10.0 Mbytes/sec [4]

Synchronous transfer rate Ultra320 SCSI

In low voltage differential (LVD) interface mode 5.0 to 320 Mbytes/sec

Sector Sizes:

Default 512 byte user data blocks

Variable 512 to 528 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.

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] Typical access times are measured under nominal conditions of temperature, voltage, and horizontal ori-

entation as measured on a representative sample of drives.

[3] Assumes no errors and no sector has been relocated.

[4] Assumes system ability to support the rates listed and no cable loss.

[5] Access time = controller overhead + average seek time and applies to all data transfer commands.

Access to data = access time + latency time.

4.3 Start/stop time

After DC power at nominal voltage has been applied, the drive becomes ready within 20 seconds if the Motor

Start Option is disabled (i.e. the motor starts as soon as the power has been applied). If a recoverable error

condition is detected during the start sequence, the drive executes a recovery procedure which may cause the

time to become ready to exceed 20 seconds. During spin up to ready time the drive responds to some com-

mands over the SCSI interface in less than 3 seconds after application of power. Stop time is 30 seconds from

removal of DC power.

If the Motor Start Option is enabled, the internal controller accepts the commands listed in the SCSI Command

Reference Manual less than 3 seconds after DC power has been applied. After the Motor Start Command has

been received the drive becomes ready for normal operations within 20 seconds typically (excluding an error

recovery procedure). The Motor Start Command can also be used to command the drive to stop the spindle

(see the SCSI Command Reference Manual).

There is no power control switch on the drive.

Minimum sector interleave 1 to 1

Minimum [3]* 63 Mbytes/sec

Maximum [3] 94 Mbytes/sec

Read/write consecutive sectors on a track Yes

Flaw reallocation performance impact (for flaws reallocated at format time using

the spare sectors per sparing zone reallocation scheme.)

Negligible

Average rotational latency 3.00 msec

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Seagate Savvio 10K Manual Page 18