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      04-03-2019, 10:07 PM   #7
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Drives: 2008 BMW 135i (E88 N54 6AT)
Join Date: Aug 2016
Location: Sunshine Coast QLD Australia

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If it's been deleted due to a time-based retention policy: Maybe.
If it's been over-written by a rolling process of writing over the oldest clip with the newest: No.

There are two ways of recovering deleted data:
1) Scan through the disk and re-link any data which is still on the disk but no longer referenced in the File Allocation Table (/Master File Table/Superbock system).

When you "delete" something, your storage device often doesn't delete the data (ie. zero it out), it simply unlinks it. This is relitively easy to recover.

2) Scan through the disk and look for 'shadow data' - the magnetic memory of the previous state of a storage block after it's been zeroed out or over-written.
This is comparatively extremely difficult, depends on the physical storage medium (SSD/SD/NVRAM/HDD), is quite unreliable, and unless you're willing to pay big money it's simpler to just say - It's just not possible.

tl;dr: If it was "deleted", you might be able to get it back. But, (no matter how it was stored,) if it's been "overwritten" it's gone.
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