Rockbox mail archive
Subject: Re: slow/delaying usb connection to archos/rockbox
From: Vladimir Pantelic (pan_at_nt.tu-darmstadt.de)
Linus Nielsen Feltzing wrote:
> On Sat, 21 Sep 2002 16:29:11 +0200, Vladimir Pantelic wrote:
>>Linux could be much quicker though if it would use the information
>>in the FS_Info sector of FAT32 where the number of free clusters
>>and the last cluster allocated are stored. So Linux has to read tha
>>whole FAT to know how much free space there is on the drive.
>>The kernel sources say that Linux does ignore this information, I
>>have no idea why ?
> For what I know, the FS_Info is not guaranteed to be correct. So
> Linux doesn't bother, and always reads the while FAT. That approach
> works on fast drives, but slow USB drives suffer from it.
For what I have seen, Windows either does is correct or puts
0xFFFFFFFF = invalid into the free sectors and last allocated count.
Even if free sectors is not correct, the last allocated cluster is a
good hint to the next free space on the drive.
Page was last modified "Jan 10 2012" The Rockbox Crew