USB pen drive error

From: Boyko Grigorov (boyko18_at_yahoo.co.uk)
Date: 09/24/04 

Date: 24 Sep 2004 04:50:48 -0700

my pen memory stick 128MG memory became unusable after an initial
period of good behaviour, i can not open it, can format it, any
attempt gives an error " wrong I/O "? What this might be?

Thanks for your help.

regards
Boyko