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Momentus 4200.2 Product Manual, Rev. C
2.5 Recording and interface technology
2.6 Physical characteristics
2.7 Seek time
Seek measurements are taken with nominal power at 25°C ambient temperature. All times are measured using
drive diagnostics. The specifications 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 5,000 measurements of seeks between
random tracks, less overhead.
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 or exceed 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 speci-
fications.
Technology Specification
Interface Parallel ATA
Recording method RLL 0,11
Recording density BPI (bits/inch typical) 778k
Track density TPI (tracks/inch typical) 126k
Areal density (Mbits/inch
2
max) 98.2
Spindle speed (RPM) (± 0.2%)
4,200 RPM-class performance (actual spin speed: 5,400 RPM)
Internal data-transfer rate OD (Mbytes/sec max) 37
I/O data-transfer rate (Mbytes/sec max) 100 (Ultra DMA mode 5)
Interleave 1:1
Cache buffer 8 Mbytes (8,184 kbytes)
Height (mm)
(inches)
9.5 +/-0.2
0.374 +/-0.008
Width (mm)
(inches)
69.85 +/-0.25
2.750 +/-0.010
Length (mm)
(inches)
100.2 +/-0.25
3.945 +/-0.010
Typical weight (grams)
(pounds)
100
0.22
Typical seek times (msec) Read Write
Track-to-track 1.5 2.0
Average 12.5 14.5
Full-stroke 22.0 24.0
Average latency 5.56 5.56