Re: clean unmount?

[Andries Brouwer <aebr@win.tue.nl>]

On Mon, Mar 10, 2003 at 11:23:22PM +0000, Matthew Wilcox wrote:

> > I don't know how the "clean unmount" information is represented in FAT.
> 
> OSR2 includes versions of the Io.sys and Win.com files that check the
> Clean Shutdown and Hard Disk Error bits in the Virtual File Allocation
> Table (VFAT) during startup. If either of these bits is turned on (that
> is, cleared to 0) on any drive present in real mode, you are prompted to
> run ScanDisk.
> 
> The Clean Shutdown and Hard Disk Error bits are the two low-order bits of
> the FAT entry for cluster 1. If bit 0 is 0, it indicates an unclean
> shutdown; if bit 1 is 0, it indicates that a hard disk error occurred on
> that drive. These bits are turned on by VFAT; they are turned off only by
> ScanDisk. The Clean Shutdown bit is turned off upon completion of a
> standard run. The Hard Disk Error bit is turned off upon completion of a
> surface scan (regardless of whether errors were repaired).

My docs say "high-order" instead of "low-order".
Are there people with a Windows system so that they can check?

Andries

http://www.win.tue.nl/~aeb/linux/fs/fat/fat-1.html#ss1.3.1