? tool in mac os x checks for bad clusters in the hard disk.

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Split/merge, redistribute free space, change cluster size, convert to logical/primary, edit sectors, compact/defragment MFT, convert to MBR/GPT, change primary slots and serial number, connect VD, surface check Create, format, delete/undelete, hide/unhide, active/inactive, assign/remove drive letter, change volume label, file system conversion (FAT to NTFS, NTFS to FAT, HFS to NTFS, NTFS to HFS), file system integrity check