lkml.org 
[lkml]   [2008]   [Jan]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [Patch] document ext3 requirements (was Re: [RFD] Incremental fsck)
From
Date
"Daniel Phillips" <phillips@google.com> wrote on 01/16/2008 06:02:50 PM:

> On Jan 16, 2008 2:06 PM, Bryan Henderson <hbryan@us.ibm.com> wrote:
> > >The "disk motor as a generator" tale may not be purely folklore. When
> > >an IDE drive is not in writeback mode, something special needs to
done
> > >to ensure the last write to media is not a scribble.
> >
> > No it doesn't. The last write _is_ a scribble.
>
> Have you observed that in the wild? A former engineer of a disk drive
> company suggests to me that the capacitors on the board provide enough
> power to complete the last sector, even to park the head.

No, I haven't. It's hearsay, and from about 3 years ago.

As for parking the head, that's hard to believe, since it's so easy and
more reliable to use a spring and an electromagnet.

--
Bryan Henderson IBM Almaden Research Center
San Jose CA Filesystems



\
 
 \ /
  Last update: 2008-01-17 22:39    [W:0.085 / U:0.092 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site