Short answer : yes your drive is probably dead but it still a "little" chance to restore it.
Read my answer in this thread for a more detailled response.
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encountered similar issue before only 8 mb left, go for a replacement
Yes, the shop gave me my money back, and for some euros more, I bought a Kingston 160 Go (identical to Intel), which was on special offer since yesterday
Win 7 in installed and running perfectly.
Thanks to all!