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Set Automatic Acoustic Management level on hard drives
Thanks very much for the information.
I have been playing around with "APM Tuner X". This utility is abandonware but some information is still available here:
http://web.archive.org/web/20011006043108/http://www01.u-page.so-net.ne.jp/gb3/eijim/index-E.html On my PB 15 with Seagate (ST9808211A) drive I was getting irritating park&clunk noises every 15-20 seconds. Apparently this frequent parking is common, and does help to save energy, but the constant parking/unparking reduces the life of the hard drive and the noise is extremely irritating. I was getting head parking 4 times a minute until I started using APM Tuner X. The rated life of the hard drive says "600,000 load/unload cycles" (seagate specs) and I had already 96865 load cycle counts for 375 power on hours. Amazingly I'd reached a sixth of the expected life of the hard drive in only 375 'on-hours'. I've emailed Seagate about this but no response so far. The APM Tuner utility allows you to manually increase a certain APM value meaning that the incessant, frequent and irritating "clunk" of the heads parking happens less often. For more information on the clunk&park look here: http://macosg.com/group/viewtopic.php?t=3944&sid=bd90b603bef94e2057c610b8e772f983 The reason for asking for an explanation is I wanted to try to apply a value in open firmware to the APM register of the disk's firmware. ie: replicate what APM Tuner does but using open firmware. It seems that the following sets the APM value:
The
After .
Set Automatic Acoustic Management level on hard drives
[update to above]
Set Automatic Acoustic Management level on hard drives
Ok, I've managed to script the APM Tuner X so that I don't have to manually set the slider and hit "Set" everytime I reboot. |
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