Voilà ce que me dis Partition Magic
Solution: Error 1516 Partition improperly dismounted
Cause 1: The partition dirty flag is set in a restart record in the journal file. This error may have been caused by a power failure or system crash while the Windows NT operating system was writing the partition.
Fix 1: This problem can often be resolved by running CHKDSK /F on the affected drive.
For instructions on running CHKDSK, see PowerQuest Solution PR4094, "How to Run Microsoft's CHKDSK from the Command Line."
If running CHKDSK /F doesn't help, please send the following items to PowerQuest Technical Support: