Trouble using second HD - Don't have permission to paste files over, file transfer speed extremely low

Hello. I am trying to copy around 700 Gb of data from one hard drive to another, but when I use the paste command Dolphin tells me I don’t have write permission to the folder. This does not happen when copying, pasting or deleting files from my other HD.

When I open the hard drive as an administrator and manage to send files over , transfer speeds are extremely low and do not go past 5 Mb/s. It also keeps asking me for the password once every five minutes, leaving me unable to do anything else during file transfer. Thanks.

Then that’s accurate, check you user permission for the drive and file ownership.

You might need to change permission recursively to your second drive or change its ownership.
That’s basic Unix stuff. File permissions and attributes - ArchWiki

Then you can have regular copy in user-space rather than the admin that needs to go through some hoops.

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Thank you very much for your answer. Someone on reddit helped me and explained just that. What happened is that I formatted the “problematic” HD as root using Gparted, so I couldn’t use it freely as a regular user. I then used the chown command to transfer ownership, and everything worked out.

Thank you again"!