[vdr] HDD spin down and VDR

Niko Mikkila nm at phnet.fi
Mon Oct 24 01:06:26 CEST 2005

On 23 Oct 2005 23:39:00 +0200
Rainer Zocholl wrote:

> > I have a VDR system with 2xFF card and 4 Harddisks.
> >
> > Now i'm not sure, if this is a good idea and hwoto do it.
> >
> > I have enable this powersaving, has it any disadvantage to the
> > livetime of the harddisk?
> No. Not if you don't spin down it every 2sec for 1sec 365*24h

Wikipedia article on hard disks (http://en.wikipedia.org/wiki/Hard_disk)
claims that some desktop hard drives are rated to only 50,000 start-stop
cycles. That means having 10 cycles a day amounts to a lifetime of 13.7 years.
However, the number of 50,000 cycles has been measured with new drives,
not 5 year old ones. In practice the drive can be expected to fail much
sooner. How much sooner, that is hard to say, but with these numbers
the normal 3 - 5 cycles / day would probably be just fine.

> Or replace the 4 small disks with one big!
> If one disk requires 10W and run 7*24h it will generate costs
> about (currently) 10..15 Euro (in Germany).
> 3 disks 45 oy
> 200GB Disk 90 oy:
> in less than 2 years the disk was paid by your energy company...

Unless you live far in the North (or even further in the South) and have
partially electric heating. Then it is probably better to leave those
disks spinning and releasing all that heat to the room. Oh well, it's
the time of year to overclock those CPUs again :)

Niko Mikkilä

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