Having problem with this one.

I have a usb I use to install Mint 19.2 and want to make it write able.

I see Google ideas which all appear to say unmount it first

when I do this it disappears from the desktop so I cannot write to it.

Any ideas?

Thanks

mount -o remount,rw /dev/sdq1

Replace "sdq1" with the actual name of the USB device.

Sorry does not work it says

cannot remount /dev/sdb1 read-write, is write-protected

When I use diskpart in Windows it does not say it is read only but in Windows it does not recognize the file system so I cannot add anything.

Any ideas

What file system is on the usb drive?
If it is an install image then it is probably/likely read only.
Make an .iso of it and mount it looback to read it. Copy the contents to a new directory, make changes, make new iso.

Or if you want to edit it in place look at losetup

Do you still have the .iso that you burned to the usb drive? If so then use that. I don't know what Mint uses. It may use squashfs for the install image. You'll have to unsquash it to edit it.

Look at:
man mount (look at loopback)
man dd (or whatever you want to make an image with)
man losetup

Have made an iso from all the folders then made a bootable usb but then that would not boot

I have unsquashed and edited and resquashed, that is what I am trying to write back deleting first the old squash but cannot delete that or rename.

I just have to make the usb writable to solve this.

Have now found the reason it is iso9660 and that is read only.

I will look for looback and try that

Thanks