See the last paragraph of our FAQ
How do I choose which formats calibre sends and where the books are stored?, which says:
Quote:
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If you are using a version of Android less than 4.4 then you can change the folder that CC uses to an arbitrary folder visible on your SD card. To do this, click the "Go to folder" button, enter the path that will contain the desired folder into the box (the default is "/", the root of the file system), then tap the "Browse" button. The screen will show the contents of that folder ("/" by default). You can navigate from there, creating folders as necessary and allowed by Android. For example, if you enter "/mnt" into the box or tap "mnt" while viewing the root then you will see all the folders inside /mnt. Probably one of the folders will be the SD card. Note: some devices do not allow writing to SD Cards. If your device is one of these, then CC cannot put books onto that card.
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