Re: [patch] My AMD IDE driver, v2.7

Pavel Machek
2002-03-19T21:22:02Z

Hi!

> > > commands. With the proper sequencing, you can even do power management
> > > of the drives in userspace. You don't want to do system suspend/resume
> > > that way, but you can certainly have a userspace policy daemon running,
> > > that powers-down and powers-up the drives, etc.
> >
> > See noflushd, Hdparm is able to powersave disks well, already, and it
> > was in 2.2.X, too.
>
> Not all of them safely, though. Many a drive will corrupt data if it
> receives a command when not spinned up. You need to issue a wake command
> first, which hdparm doesn't, it just leaves it to the kernel to issue a
> read command or whatever to wake the drive ...

Is this common disk bug, or are they permitted to behave like that?

Pavel
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