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try to do a hard reset
i do not know if u have a button to do that search for it in the back or the side of ur coby and press it with a pin, and u can do it from stock recovery (wipe data/factory reset) volume up + volume down + power or volume down or up + home button + power)how to do the hard reset of my device? my device is 7048
I agree that the internal SD is damaged, possibly due to a bad format. This may be fixable, depending on whether you can get the partition name (e.g. nandi). Your tablet I believe can use the fastboot executable, and thus you could attempt to erase the partition using fastboot.i think that ur internal sd card is damaged, u can fix it by formating it, flash cwm and just format it. or format using otg cable on ur laptop
fastboot erase <partition>