With the Kobo you have a choice on the device as to whether you want to manage it (ie connect to a host PC) or continue reading (ie let the device charge while you continue to read).
Remember that Kobo expose the storage via as a basic USB storage device, meaning there is no support for simultaneous updates to files on it from the host and the Kobo itself, so, if the Manage option is selected, the partition is actually dismounted from the Kobo before being made available to the Host.
When the device is then unplugged, the partition is re-mounted on the Kobo.
As for the iamge on the device, there is an option on the Kobo to select whether or not you want the cover of the currently read book displayed when it is either in sleep mode, or powered off.
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