Unlocking the file

You can unlock files from within the terminal using the chflags command with nouchg:

sudo chflags -R nouchg filepath

According to the man page for chflags:

uchg is the user immutable flag

no in front of a flag removes the flag: nouchg

Preventing this from happening in the future

A general solution would probably be to avoid handling permission altogether and using NTFS or FAT for an exchange partition.

However, I specifically voided such a solution (FAT32) this time, because I encountered serious errors the last time.

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osx – Data on file exchange partition is owned by 1000 and locked. How can I unlock this in OS X? – Ask Different.

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