External hardisk suddenly disappeared !!

hello ..
Im using macbook pro
sys: snow
just two days ago .. I tried to connect my external hardisk .. but when I did .. it suddenly don't work !!
but when I blog it in a windows sys it works !
this is not the problem the problem is .. it was working before but now it doesn't !?
I also have a windows sys installed in my mac .. the hardisk of it was showed on desktop but now it also disappeared !
I tried to repair permission .. but it was useless ..
something is wrong here .. !
any solution rather than formating my external hardisk ?
or trying to show it again !

Hi,
I have the same issue, this time with OS X 10.5.8.
I last mounted the device about 30 days ago and performed a Time Machine backup with it.
Yesterday I plugged it in and it refused to mount. I have tried it in a Windows box and it mounts fine. I have also tried another drive (FAT formatted) in my Macbook Pro, and it did mount the first time I plugged it in, but not the second!
Any help would be great.
Thanks
T

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