My mp4 files are being changed to m4v when copied to an external drive, how can I stop this happening?

I bought a 1 TB external drive to store my mp4 movies on. It's accepted 80 GB of them, but any more I try to copy in are being changed to m4v files - which of course cannot be played! What can I do to stop this happening?

iMac (2017 – 2020)

Posted on Dec 9, 2023 11:13 AM

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17 replies

rkaufmann87

Level 10

148,470 points

Dec 12, 2023 9:08 AM in response to Cadleigh

At the moment I have other fish to fry (leaving on a trip on Thursday) so yup I have lost interest.

BDAqua

Level 10

250,253 points

Dec 12, 2023 9:17 AM in response to Cadleigh

Old versions, maybe 4.1?...

https://macdownload.informer.com/etrecheck/versions/

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My mp4 files are being changed to m4v when copied to an external drive, how can I stop this happening?

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