Hard drive spin down - good or bad for the drives

Having had a few drives fail recently, I've started to wonder about the whole issue of the energy saver preference for having hard drives spin down. I've always had it disabled because it seems to be generally believed that that's the way to work on a fcp (or avid for that matter) editing system. But now that I've started imagining every drive failing, I'm wondering whether it makes sense to perhaps have another user account that I switch to for nonediting moments in which the spin down option is enabled.
Any opinions out there?

Drive manufacturors report a MTBF (mean time between failures) often in the 200,000 hours range. This works out to something like 22 years. Drives that fail in less time than that are often subjected to three things:
- heat
- voltage irregularities - spikes or brownouts
- physical shocks
oh, and did I mention heat?
As drive RPM increases, so does energy consumption and heat. The best thing you can do for drives is to keep them in a cool, well ventilated location and to put them on a conditioned power supply.
FWIW, I have scsi drives that are over 10 years old running everyday with no issues.
Spindown seems to be an energy saver issue but I wonder about the cycle of powering down and back up over and over and over. It seems like that would put much more stress on bearings, motors and the like.
good luck.
x

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I have installed a second hard drive (500GB Western Digital SATA SE16) in my Mac Pro quad-core. The drive spins down regardless of the power management settings (system preferences) and does so even when I’m actively working, but not directly accessing the second drive. It then spins up, with a corresponding time lag of 10-20 seconds and the spinning beach ball, when drive access is necessary. I know from the WD website that there is a setting for a jumper on pins 3 & 4 which will prevent spin down (much like would be required for a RAID setup). Does it make sense to enable that jumper to prevent spin down in this case? Will the system power management settings still function properly with the jumper set? Thanks for any input.

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"I'd really love to be able to work in silence.. and also save my poor hard disk !"
As you already know, constantly spinning up and down is very bad for a hard disk.
The best would be to have it sleeping all the time, but if this is not possible, better leave it spinning constantly then.
"What is the annoying Panther feature (that Jaguar or OS9 didn't have) that keeps spinning my disk ?"
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My guess is that this didn't happen to your newly installed system, but now happens because there is much more fragmented free space on your hard drive.
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The default spindown time if you choose "Put the hard disk(s) to sleep when possible" in Energy Saver, is 10 minutes of inactivity.
You can use Cocktail or TinkerTool System to modify this 10 minutes delay, or paste this Terminal command:
sudo pmset -a spindown 2
to reduce the required inactivity to 2 minutes
(but again, this is not what you are looking for, as this is worse than leaving it constantly spinning, unless perfect silence is so important to you).
I don't know how to tell Mac OS X to behave like former systems though, and I don't even know if it is possible at all.
Usually someone would like to set a longer spindown delay, like
sudo pmset -a spindown 120
for example.
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Hard drive spin down - good or bad for the drives

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