Quoth is correct.
Calibre needs RW as it writes (and later, reads) 2 files to the to the root of the device. this keeps track of what books are there without having to do a device scan (can really take time).
If this is a work computer, it begs the question as to if Company Policy even allows installation of foreign (to IT) software. Places I worked that had that policy was a quick way to the unemployment line.
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