The best method I have been able to find is to examine the spread of
data points in HD Tune's read or write benchmark graphs. AISI, the
total access time is the time required to seek to the target track,
plus the time required for the target sector to appear under the head.
The rotational latency can vary from 0 msec up to the time required
for one complete revolution. Hence the width of the access time graph
must correspond to the latency of one rotation. For example, a 7200
RPM drive would have an 8 msec wide access time graph.
Here are more HD Tune results which show how RPM affects access time:
WD15EARS-00Z5B1 - 5400 RPM ?
http://sylphys.ddo.jp/upld2nd/pc3/src/1267687303631.png
WD15EADS-00P8B0 - 5400 RPM ?
http://ettcweb0.aa0.netvolante.jp/log/20090830004.png
ST32000542AS Barracuda LP - 5900 RPM:
http://users.telenet.be/Mastakilla/HDs/6XW19HYS_write2.JPG
WD2001FASS-00U0B0 - 7200 RPM:
http://dl6.getuploader.com/g/6%7Cnews23/18/HDTune_Benchmark_WDC_WD2001FASS-00U0B0%5B64kB%5D.png
WD5001AALS-00L3B - 7200 RPM:
http://bbsimg01.kakaku.com/images/bbs/000/236/236059_m.jpg
WD1500HLFS-01G6U0 - 10K RPM:
http://dl7.getuploader.com/g/6%7Cnews23/20/HDTune_Benchmark_WDC_WD1500HLFS-01G6U0.png
ST3600057SS - 15K RPM:
http://images.kbench.com:8080/kbench/article/2009_09/k73831p1n6.jpg
- Franc Zabkar
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>http://www.silentpcreview.com/article786-page2.html
Thanks, that's clever, but if were going to measure it directly, I
would just break out my scope.