I tried a 16GB SDHC card and can confirm that the Kobo firmware is not operating correctly when attempting to write to the card.
Calibre gives the following errors (Windows version is shown, although the issue would exist on Linux or any other OS) with the larger card:
Quote:
Errno 13: Permission denied: u'I:\\metadata.calibre'
Traceback (most recent call last):
File "site-packages\calibre\gui2\device.py", line 64, in run
File "site-packages\calibre\gui2\device.py", line 308, in _books
File "site-packages\calibre\devices\kobo\driver.py", line 222, in books
File "site-packages\calibre\devices\kobo\driver.py", line 650, in sync_booklists
File "site-packages\calibre\devices\usbms\driver.py", line 308, in sync_booklists
File "site-packages\calibre\devices\usbms\driver.py", line 305, in write_prefix
IOError: Errno 13 Permission denied: u'I:\\metadata.calibre'
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Quote:
calibre, version 0.7.46
ERROR: Error: Error communicating with device
Error 23 Data error (cyclic redundancy check): 'I:\\books'
Traceback (most recent call last):
File "site-packages\calibre\gui2\device.py", line 64, in run
File "site-packages\calibre\gui2\device.py", line 372, in _upload_books
File "site-packages\calibre\devices\usbms\driver.py", line 184, in upload_books
File "site-packages\calibre\devices\usbms\device.py", line 971, in create_upload_path
File "os.py", line 157, in makedirs
WindowsError: Error 23 Data error (cyclic redundancy check): 'I:\\books'
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As the 2GB SD card was working properly (once any broken or damaged *.epub's were removed) it would appear that the only way to write to a larger card is to insert it into a standard card reader (not a Kobo) and copy the *.epub files directly. Even then, expect to be looking at "device is indexing new content" or startup screens for a very long time before the Kobo might actually let you read the contents of your new SDHC card.
I suspect this confirms (from directly across the border) the pattern reported by the original poster?