關於檔案 lost 的問題，我在 perfectdisk 8.0.58 的 release note 裡發現了一些端倪

5. Worked around a hardware driver issue on XP, Win2000 and Windows Server 2003 which effected boot-time defrag. In Srv03 & Vista a new storage control, IOCTL_DISK_COPY_DATA, was added that defrag operations should attempt to use when moving file data to accomplish two results:
o reduce the problem of VolSnap.sys shapshots being prematurely purged and
o increase performance where the underlying hardware may be able to "move" file data by just shuffling pointers.
If this new control fails, data is moved the normal brute force way (i.e. read it from here and write it to there). We have discovered that some hardware reported success when indeed they failed to correctly redirect the pointers. This issue can cause data loss.

意思是有些硬體(硬碟？南橋？)在使用 IOCTL_DISK_COPY_DATA 這個 control 的時候，即使失敗了也回報成功，因此會造成資料遺失的問題...

從 release note 看不出 perfectdisk 對這個問題到底如何處理，若照它所說只有 Server 2003 & Vista 有用到 IOCTL_DISK_COPY_DATA 的話，那 XP/2000 應該不用擔心才是