The disks contain(ed) proprietary format video files for a DVR, and were full.
On the first disk (1TB), I did a search and found a partition (I don't recall if it was one or two at this point), and wrote it to disk. It came up as a D: (RAW) in the OS upon reboot.
In testdisk, if I select the D: drive, and at the subsequent screen I leave the default value of [None] Non Partitioned Media), then under filesystem utils I see:
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TestDisk 7.0, Data Recovery Utility, April 2015
Christophe GRENIER <grenier@cgsecurity.org>
http://www.cgsecurity.org
> P NTFS 0 0 1 121600 253 63 1953520002
If I select [ Boot ], I see:
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Boot sector
Status: OK
Backup boot sector
Status: OK
Sectors are identical.
A valid NTFS Boot sector must be present in order to access any data; even if the partition is not bootable.
On the 4tb disk, before scanning, I see:
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Disk /dev/sdc - 4000 GB / 3726 GiB - CHS 486401 255 63
Current partition structure:
Partition Start End Size in sectors
No FAT, NTFS, ext2, JFS, Reiser, cramfs or XFS marker
1 P MS Reserved 34 262177 262144 [Microsoft reserved partition]
1 P MS Reserved 34 262177 262144 [Microsoft reserved partition]
So, right now I'm scanning. It looks like it may take longer than 10 hours, even though it started at 54%.
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Disk /dev/sdc - 4000 GB / 3726 GiB - CHS 486401 255 63
Analyse cylinder 267360/486400: 54%
MS Data 2048 4294045695 4294043648
MS Data 4293124097 4294045696 921600
MS Data 4294045696 4294967295 921600
Any pointers would be appreciated.