Windows is failing to get the free space on your device, so
calibre cannot connect to it. This is usually caused by hardware
errors. You can try:
1) Trying a different USB port/cable.
2) Rebooting your device and your computer
3) Resetting your device
If none of these work, you can use the 'Connect to Folder' function
in calibre to connect to your device. Click the Connect/share
button on the calibre toolbar and select the "Connect to folder"
option. Then choose the folder on your device that you want calibre
to connect to.
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