Performance Characteristics; Internal Drive Characteristics; Scsi Seek Performance Characteristics - Seagate ST15150N - Barracuda 4.3 GB Hard Drive Product Manual

ST15150N/ND/W/WD/WC/DC Product Manual, Rev. D
5.0
5.1
5.2

Performance characteristics

This section provides performance-related characteristics and features of
Barracuda 4 drives.

Internal drive characteristics

Drive capacity, Mbytes unformatted
Read/write data heads, maximum (physical)
Bytes per track, average bytes
Bytes per surface, Mbytes unformatted
Cylinders/tracks per surface, user accessible
Tracks per inch
Bits per inch
Servo heads
Internal data rate per physical head, Mbits/sec,
variable with zone
Disc rotation speed
Avg rotational latency, msec

SCSI seek performance characteristics

ASA I download code thermal calibration (TCAL)
All performance characteristics assume that thermal calibration is not in
process when the drive receives the SCSI command. Thermal calibration
will not interrupt an active SCSI command. If thermal calibration is in
process when a SCSI command is received, the command is queued until
the calibration for the specific head being calibrated completes. When
calibration completes for the specific head being calibrated, the first queued
SCSI command executes. When execution of the first queued command is
complete, the drive continues the calibration for the remaining head.
The above procedure continues until calibration for all heads has com-
pleted, or until 10 minutes have elapsed. The drive initiates a thermal
calibration cycle once on power-up before completing its initialization
sequence and then once after 1 minute from the end of initialization. After
this, the drive initiates thermal calibration cycle approximately once every
10 minutes. Automatic non-interruptible thermal calibration occurs at
other times but should be transparent to the user (e.g., during format,
Rezero command, at spindle-up, during read error recovery, and during
reassign block functions). You can use the Rezero command to reset the
thermal calibration timer back to its start so that the host knows when the
interruption for thermal calibration will occur.
11
5,062
21
64,160
232.4
3,711
4,048
73,820
1
47.5 to 72.0
7,200 0.5%
4.17