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TechniSol · 03-10-2013, 01:12 AM

I think you're coming back to issues like how storing books on external SDHC cause the reader to have to regenerate covers each time. You may also be having problems with bad epubs, or being limited by SDHC performance that may not be what it seems according to the published specs. A number of sources point to how class 2 SDHC cards may outperform class 10 devices by a factor of 50-100 times for short random writes. Think cover generation.

There may also just be firmware issues that will get resolved later. Have you transferred all the books from your SDHC onto the pc hard drive? If so, why not try reformatting the SDHC to clean it up, setting calibre's plug-in for Kobo to copy covers to the SDHC in black and white to prevent the need to generate them, and then copying a small number of titles/shelves over at a time and see if you can find a point at which it slows down, or better yet, first try only moving content to the internal memory and see if performance is better without the external card installed.

My guess is you'll have a lot less trouble if you stick to the internal storage until Kobo gets their hats on straight and does permanent cover generation and the like for the external SDHC -though setting up the cover generation in Calibre should help. OTOH, depending on how they hung the external SDHC off the hardware, the external may be intrinsically slower... time will tell. Though there are posters that have said they have 3000 files on their readers, whether on internal or external SDHC I can't say.

03-10-2013, 01:12 AM	#37
TechniSol GranPohbah-Fezzes r cool! Posts: 1,056 Karma: 3151024 Join Date: Jul 2010 Device: Nook STRs, Kobo Touch, Kobo Glo	I think you're coming back to issues like how storing books on external SDHC cause the reader to have to regenerate covers each time. You may also be having problems with bad epubs, or being limited by SDHC performance that may not be what it seems according to the published specs. A number of sources point to how class 2 SDHC cards may outperform class 10 devices by a factor of 50-100 times for short random writes. Think cover generation. There may also just be firmware issues that will get resolved later. Have you transferred all the books from your SDHC onto the pc hard drive? If so, why not try reformatting the SDHC to clean it up, setting calibre's plug-in for Kobo to copy covers to the SDHC in black and white to prevent the need to generate them, and then copying a small number of titles/shelves over at a time and see if you can find a point at which it slows down, or better yet, first try only moving content to the internal memory and see if performance is better without the external card installed. My guess is you'll have a lot less trouble if you stick to the internal storage until Kobo gets their hats on straight and does permanent cover generation and the like for the external SDHC -though setting up the cover generation in Calibre should help. OTOH, depending on how they hung the external SDHC off the hardware, the external may be intrinsically slower... time will tell. Though there are posters that have said they have 3000 files on their readers, whether on internal or external SDHC I can't say.