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Strange hard drive issue that only Linux fixes - Page 2

post #11 of 13
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OMG I fixed it.

Yeah, so there's these jumpers at the back. By default there's one shorting 3 and 4 which supposedly enables Power Up In Standby (PUIS). I took it out, put it back in with no jumpers, and all is well, spins up normally under BIOS. Haven't tested Windows yet, but I suspect it will be fine.
Quote:
PUIS requires corresponding BIOS support. If PM2 is enabled on the drive but not supported by the BIOS, the drive will not be detected by the system or detected as zero in size. PUIS is typically only supported on RAID Controllers.
http://en.wikipedia.org/wiki/Power-up_in_standby. My exact issue. Still doesn't explain why Linux was totally fine with it. Maybe because it's awesome (and sends the proper wake-up command).

Could have sworn I tried this already, but I may just have shuffled the jumper around rather than just taking it out. Thanks anyway guys.
Edited by vladsinger - 3/11/11 at 4:49pm
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post #12 of 13
Quote:
Originally Posted by error10 View Post
Yep, I don't see any problem there; 4.9 seconds isn't bad at all. So that doesn't make a lot of sense.

The only thing I can really suggest at this point is to stop using Windows.
Quote:
Originally Posted by mushroomboy View Post
I second the notion of removing windows, It's a life changing experience (for the good).
LOL, i was going to say something like this, but didn't feel like being labeled "fanboi" today

Quote:
Originally Posted by vladsinger View Post
OMG I fixed it.

Yeah, so there's these jumpers at the back. By default there's one shorting 3 and 4 which supposedly enables Power Up In Standby (PUIS). I took it out, put it back in with no jumpers, and all is well, spins up normally under BIOS. Haven't tested Windows yet, but I suspect it will be fine.

http://en.wikipedia.org/wiki/Power-up_in_standby. My exact issue. Still doesn't explain why Linux was totally fine with it. Maybe because it's awesome (and sends the proper wake-up command).

Could have sworn I tried this already, but I may just have shuffled the jumper around rather than just taking it out. Thanks anyway guys.
its actual quite simple, linux is smarter than windows...honestly without researching it more...i'd honestly would say that the kernel detected the drive, tried to initialize it, realized there was a problem, and as you said sent a "wake up" to it.

i'd still be a bit concerned to why windows would play stupid on the FS thing...how it would allow a creation of one, but upon next boot would forget there was one or didn't see one...

but at anyrate, good job and good luck
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post #13 of 13
Linux doesn't use the BIOS to talk to your hard drives. If it sees one in standby, it knows how to wake it up and doesn't need any help from the BIOS to do so.

Power-up in standby is a virtual necessity with large RAID setups since, hard drives don't draw their maximum power during normal operation, they draw their maximum amount of power while spinning up. If you tried to spin up 32 drives at once, you'd blow your PSU. So a RAID controller will spin up a few drives at a time (or as few as one at a time) until they're all running.
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