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8 Momentus XT Product Manual, Rev. D
3.7 Seek time
Seek measurements are taken with nominal power at 25°C ambient temperature. All times are measured using
drive diagnostics. The specifications in the table below are defined as follows:
• Track-to-track seek time is an average of all
possible single-track seeks in both directions.
• Average seek time is a true statistical random average
of at least 5000 measurements of seeks between
random tracks, less overhead.
Table 2: Typical seek times
Typical seek times (ms) Read
Track-to-track 2.0
Average 11.0
Average latency 4.20
Note. These drives are designed to consistently meet the seek times represented in this manual. Physical
seeks, regardless of mode (such as track-to-track and average), are expected to meet the noted
values. However, due to the manner in which these drives are formatted, benchmark tests that
include command overhead or measure logical seeks may produce results that vary from these
specifications.
3.8 Start/stop times
Time to ready Typical
Max @ 25°C
Power-on to Ready (sec) 5.0 5.5
Standby to Ready (sec) 3.5 4.0
Note. Time-to-ready may be longer than normal if the drive power is removed without going through
normal OS powerdown procedures.
3.9 Power specifications
The drive receives DC power (+5V) through a native SATA power connector.
3.9.1 Power consumption
Power requirements for the drives are listed in the table on
page 8. Typical power measurements are based on
an average of drives tested, under nominal conditions, at 25°C ambient temperature.
• Spinup power
Spinup power is measured from the time of power-on to the
time that the drive spindle reaches operating speed.
• Seek mode
During seek mode, the read/write actuator arm moves towar
d a specific position on the disc surface and does
not execute a read or write operation. Servo electronics are active. Seek mode power is measured based on
three random seek operations every 100 ms. This mode is not typical.
• Read/write
power and current
Read/write power is measured with the heads on track, ba
sed on three 63 sector read or write operations
every 100 ms.