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Originally Posted by SUSGOD
I just don't understand why SD cards will allow 682+ image files on one level but limit e-books to 150. My old Cybook's SD feature could not read folders, but fortunately my Aluratec can.
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The limit is not the SD card itself, but the file system used on the SD card. In a nutshell, IF the FAT filesystem is used on your SD card, then the number of entries available in the root of the filesystem is determined at the time the SD card is formatted. The standard limit is 512 entries in the root, so if you got 682+, then whatever you were using to get that was a nonstandard FAT filesystem. You should also note that 512 entries is for the old 8.3 file naming convention, so if you use long filenames you will get much less than 512 files and folders in the root.
Maybe this Wikipedia link can explain what is going on to your satisfaction?
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The number of root directory entries available is determined when the volume is formatted, and is stored in a 16-bit signed field, defining an absolute limit of 32767 entries (32736, a multiple of 32, in practice). For historical reasons, FAT12 and FAT16 media generally use 512 root directory entries on non-floppy media. Other sizes may be incompatible with some software or devices (entries being file and/or folder names in the original 8.3 format)
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http://en.wikipedia.org/wiki/File_Allocation_Table