File Size, CR2 Recovery

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wani0402

File Size, CR2 Recovery

Post by wani0402 » Tue Apr 23, 2019 10:28 pm

I recently ran a large data recovery of photos on a RAID5 NAS (around 10,000 Canon CR2 RAW files), and it seems to have recovered a majority of the data, but the files are a smaller size and lower resolution (2560x1707). These are usually ~24MB, 21MP images. Is this expected? I can certainly work with 4.4MP images since I would otherwise have nothing, but I am just curious about why and if there is something I scanned incorrectly.

Alt
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Re: File Size, CR2 Recovery

Post by Alt » Wed Apr 24, 2019 9:46 am

All depends on actual data on the RAID. Looks like you assembled the RAID and scanned it correctly.

wani0402

Re: File Size, CR2 Recovery

Post by wani0402 » Wed Apr 24, 2019 9:51 am

Okay -- so if the original files were 24MB, how can a valid restored file be of different size and resolution? In my limited restoration experience I would expect this to generate a corrupt file.

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Re: File Size, CR2 Recovery

Post by Data-Medics » Wed Apr 24, 2019 1:51 pm

I've seen cases where an embedded thumbnail inside the file caused it to think it was at the end and truncated the file sizes. Try disabling the *.jpg extension and do the scan again for just CR2 files alone. Usually, that can solve it. If not, you'd just have to create a custom file type for the CR2 format.

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Re: File Size, CR2 Recovery

Post by Alt » Wed Apr 24, 2019 2:15 pm

wani0402 wrote:
Wed Apr 24, 2019 9:51 am
Okay -- so if the original files were 24MB, how can a valid restored file be of different size and resolution? In my limited restoration experience I would expect this to generate a corrupt file.
What extension do those files have? Maybe they're jpg rather than cr2?

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Re: File Size, CR2 Recovery

Post by Alt » Wed Apr 24, 2019 2:16 pm

Data-Medics wrote:
Wed Apr 24, 2019 1:51 pm
I've seen cases where an embedded thumbnail inside the file caused it to think it was at the end and truncated the file sizes. Try disabling the *.jpg extension and do the scan again for just CR2 files alone. Usually, that can solve it. If not, you'd just have to create a custom file type for the CR2 format.
Embedded thumbnails are usually much smaller in size.

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