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mark c
08-01-2009, 09:20 AM
Hi, the power line up our road is being redone and this will mean rolling power outages and some of us are worried about getting head crash on our PCs when the power goes off.
AFAIK a PC does not have some sort of emergency power supply to return the HD head to a safe place after a power cut, so using one when you're likely to have a power cut is taking a risk but then I have had lots of power outages while using the PC and it does boot up again later.
I've had a look a various sites about HDs and head crashes but can't find anything that tells me what happens with a power cut and more particularly how come you don't get a crash with a power cut.
TIA -mark

Speedy Gonzales
08-01-2009, 09:27 AM
The easiest way to avoid it, is leave it off. Till they finish

robsonde
08-01-2009, 09:33 AM
Hi, the power line up our road is being redone and this will mean rolling power outages and some of us are worried about getting head crash on our PCs when the power goes off.

head crash due to power failure is a very old problem, was solved in 1994-ish
moden drives auto park the heads and so avoid head crash.

the problem you may get is data loss due to a data write at time of power fail.
or you may get other damage due to power spikes.

best advise is to get a surge protector, turn off and unplug computer if you know that there is work being done in the streat.

wratterus
08-01-2009, 09:35 AM
Or borrow (or buy) a UPS.

Trev
08-01-2009, 09:53 AM
Yes a universal power supply which runs on batterys gives you enough time to turn your computer off after the power goes off.
:)

wratterus
08-01-2009, 09:55 AM
Uninterruptible Power Supply. ;)

wainuitech
08-01-2009, 10:08 AM
Uninterruptible Power Supply. ;)
X 2 A UPS will safe you from a power Drop / outage -they also have surge protectors built in.

A stand alone surge protector will do NOTHING in a power cut - the PC will still suddenly shut down.

mark c
08-01-2009, 10:18 AM
Thanks very much for all that. I know about UPSs - I was more wondering about what happens in a cut w/out UPS and why you don't get a head crash. So thanks robsonde. It doesn't bother me to use the simple solution suggested to just not use the PC but then I'm not the only user up the road. Will encourage them to get a UPS.

wratterus
08-01-2009, 10:40 AM
Good idea. A decent one can be picked up for around $300 now, and it's really good cause it acts as a surge/spike protector as well as not allowing 'brown outs' to affect the equipment plugged into it.

Brown Outs are often worse for PCs than a normal power cut, they like a constant supply of power.

Trev
08-01-2009, 10:55 AM
Uninterruptible Power Supply. ;)
I new that ;)
:)

wratterus
08-01-2009, 11:18 AM
Well if you new it why did you call it a universal power supply? :p

jwil1
08-01-2009, 11:57 AM
If you're on a laptop, you could just use the battery :)

Trev
08-01-2009, 12:07 PM
Well if you new it why did you call it a universal power supply? :p
Just had a senior moment.:D

feersumendjinn
08-01-2009, 09:10 PM
Dick Smith has cheaper ones
http://www.dse.co.nz/dse.filereader?4965b33c02706f4c273fc0a87f3b06e1+EN/catalogs/CTG0002065

pctek
09-01-2009, 09:47 AM
head crash due to power failure is a very old problem, was solved in 1994-ish
moden drives auto park the heads and so avoid head crash.



Just what I was about to say.

Nothing to do with current power problems.
Most quality PSUs will die without taking the rest of the PC with it but I'd be inclined to unplug it anyway. Don't tempt fate.

Rubbish PSUs will cause an exciting visit to your insurance company.

wratterus
09-01-2009, 09:55 AM
Dick Smith has cheaper ones
http://www.dse.co.nz/dse.filereader?4965b33c02706f4c273fc0a87f3b06e1+EN/catalogs/CTG0002065

Those $215 dynamix ones are excellent.