anyway - same deal, new prob. it worked for a while

. now i am getting
calibre, version 0.8.7
ERROR: Unhandled exception: <b>DatabaseException</b>:disk I/O error
RemoteTraceback (most recent call last):
File "site-packages/calibre/library/sqlite.py", line 268, in run
File "site-packages/calibre/library/sqlite.py", line 163, in get
OperationalError: disk I/O error
Traceback (most recent call last):
File "site-packages/calibre/gui2/metadata/single.py", line 367, in fetch_metadata
File "site-packages/calibre/gui2/metadata/single.py", line 328, in update_from_mi
File "site-packages/calibre/gui2/metadata/basic_widgets.py", line 392, in auto_generate
File "site-packages/calibre/library/database2.py", line 2071, in author_sort_from_authors
File "site-packages/calibre/library/sqlite.py", line 308, in run
DatabaseException: disk I/O error
RemoteTraceback (most recent call last):
File "site-packages/calibre/library/sqlite.py", line 268, in run
File "site-packages/calibre/library/sqlite.py", line 163, in get
OperationalError: disk I/O error
very strange