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I have a 6 TB external hard drive which suddenly does not show up in the Windows Explorer (so, I can't run Chkdsk on it).

Disk Manager doesn't give me many options, other than to format.

I could run some undeleter, but that would reccover to an external drive - and I don't have one that large.

Is there any gratis program that will help me repair the file table in-situ?

The disk was formatted for Windows (exFat), buy I will recover from any o/s.

I am not looking for file by file recovery (undelete), but for File Allocation Table repair

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    Don't know if this will help, but 1) Try using the file manager on the Home Partition Wizard by MiniTool and 2) try their recovery software, I've had great luck with their software, just try their free versions and see what it picks up. – Tom Aug 12 '16 at 2:00
  • I love the partition tool & have used it for years (+1). Alas, it cannot help. And I can't afford USD 60 for soemthing that might help, or might not. I will update the question & tag it gratis – Mawg Aug 12 '16 at 8:14
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    The situation you describe sounds a lot like a broken MBR rather than a broken FAT. What makes you think you need to repair the FAT? If you have additional details in this regard, they could help. – Andrea Lazzarotto Aug 12 '16 at 21:10
  • This is not a bootable disk (sorry, I shoudl have said that), so I don't see that it is an MBR porblem. When a whole single disk partition changes from fine to invisible, I always think of the FAT - what do you reckon? – Mawg Aug 12 '16 at 22:08
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The Linux System Rescue CD can be burnt onto a CD or USB drive and when booted from offers lots of tools to repair your system, (even if it is a windows system).

  • Includes partition editing tools, (GParted & GNU Parted)
  • sfdisk and
  • TestDisk which can:
    • Fix partition table, recover deleted partition
    • Recover FAT32 boot sector from its backup
    • Rebuild FAT12/FAT16/FAT32 boot sector
    • Fix FAT tables
    • Rebuild NTFS boot sector
    • Recover NTFS boot sector from its backup
    • Fix MFT using MFT mirror
    • Locate ext2/ext3/ext4 Backup SuperBlock
    • Undelete files from FAT, exFAT, NTFS and ext2 filesystem
    • Copy files from deleted FAT, exFAT, NTFS and ext2/ext3/ext4 partitions.

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