random freezes due to flash disk

[the muppeteer]

Hello,

My system:

Red Hat Linux 7.2 with kernel 2.4.20 with MTD support
No swap (can't have one).

It all seems to work fine until I start XFree86. Then the flash gets 
corrupt, even if it is not mounted !
My linux then starts to freeze for several seconds or crashes when I do any 
operation on my flash (M-Systems disk-on-chip 2000) like a mount,e2fsck...or 
sometimes completely at random.
The hardware is ok as I already tried 3 different flash disks just to make 
sure and I always get the same result.

Any clues ?


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