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Pcmanfm puts a trash can on USB drives, which fill up quickly without people knowing why as the file is hidden. It would be a good idea to either make it as an option in preferences or disable the Trash can for optical and USB drives.
I have the same problem if I delete a file as a regular user.
But if I do that as root, I have the following message :
"Some files cannot be moved to trash can because the underlying file systems don't support this operation.
Do you want to delete them instead?"
Then it seems to me that when pcmanfm is launched as a regular user, it fails to find if a file system has support for a trash can or not.
I forgot to say that I also found this problem (with USB drives formatted as FAT32)
with the latest git version of libfm and pcmanfm, with udisks support enabled or not.
This is implemented according to freedesktop.org Trash specification.
It's the current de facto desktop standard. If you find this annoying,
bug report to xdg and suggest some better solutions.
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