USB Mass storage

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Hi All,
I have USB host controller driver included in my OS image. USB
keyboard and USB mouse are working fine. When I atatched USB flash key of
512MB or 256 MB, WinCE 5.0 Doesn't recognise them and in explorer window, I
cannot see "Hard Drive". USB flash keys are working fine, I tested on XP
machine and they are formatted with FAT file system.

When I attached the keys WinCE loads the USBMSC.dll and USBDISK6.dll and
when I detached the keys, driver gets unloaded. The LED on flash keys gets
power on as soon as I attached them.

in CONTROL PANEL --> Storage Manager it shows DSK1: IDE Hard Disk Drive.
Capacity 250MB. It means WinCE does recognise the keys ??

I tried diffrent manufacturer keys, but not even one is showing in Explorer
window.

Further debug messages I get are

[NOTIFY] HandleSystemEvent 7 /ADD DSK1:
Command Block Status: Command Failed
ScsiGetSenseData - SenseKey:0x6 ASC:0x28 ASCQ:0x0
SENSE_UNIT_ATTENTION : ASC_MEDIA_CHANGED
ScsiTestUnitReady ERROR:20
Unsupported IOCTL:0x71c24
DSK_IOControl error: 50

Please can someone help me out or here am I missing something ?? USB
keyboard and mouse are working , Flash key drivers are loading but unable to
see them in explorer window.

I appreciate your help

Thanks in advance
.



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