MobileRead Forums - View Single Post - 903 microSD write fails on PocketBook 903

LoneTech · 01-02-2011, 05:10 PM

I copied it to and from a file on my laptop hard disk, without mounting the microSD card, using dd. I tested this with both a USB card reader and the PocketBook.

I'm not sure what you meant by empty card, though I must note the PocketBook may not export the whole card if it has been partitioned. I have my card unpartitioned, and attempted to overwrite it with the exact contents it already had. Modifying the filesystem led to unpredictable effects, including corruption.

Yes, single operations within the PocketBook 903 Files tab failed. I tried renaming a directory, renaming a file, moving a file to a different directory, and deleting a file. Only the file rename attempt had any effect, creating an empty file.

I am using Debian GNU/Linux.

I believe this problem is easier to trigger with a slow microSD like mine. For faster ones, it will probably occur if you do many small writes all over the card (not sequentially).

01-02-2011, 05:10 PM	#7
LoneTech Zealot Posts: 135 Karma: 7767 Join Date: Oct 2010 Device: PocketBook Pro 903	I copied it to and from a file on my laptop hard disk, without mounting the microSD card, using dd. I tested this with both a USB card reader and the PocketBook. I'm not sure what you meant by empty card, though I must note the PocketBook may not export the whole card if it has been partitioned. I have my card unpartitioned, and attempted to overwrite it with the exact contents it already had. Modifying the filesystem led to unpredictable effects, including corruption. Yes, single operations within the PocketBook 903 Files tab failed. I tried renaming a directory, renaming a file, moving a file to a different directory, and deleting a file. Only the file rename attempt had any effect, creating an empty file. I am using Debian GNU/Linux. I believe this problem is easier to trigger with a slow microSD like mine. For faster ones, it will probably occur if you do many small writes all over the card (not sequentially).