Transfering raw and mpeg-4 files

Why does NixOS closes my USB connection while I’m transferring 1130 raw files? It does it more than once. Every time I have to remount the USB key (sometimes it takes more than one attempt) so I can continue to transfer all my files.

usb can be finicky. I’ve had these type of errors happen due to: cheap/chewed cable, older controllers in the usb drives, old failing storage (nand or spinning rust), and worn usb ports on my laptops.

I would try ensuring that these aren’t the case then look at logs in dmesg to see if there’s any errors or funkyness.

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Thank you for your answer. I have no issues when transferring the same files in Windows from the same USB key (with SSD cards from my R6 Mark II).

Is dmesg a file somewhere in NixOS?

dmesg is a command to view the kernel log. You can also use journalctl -k.