Here's the error message I just received when I connected my H202 to Windows 7, opened Calibre, and tried to compress the database:
Spoiler:
calibre, version 3.6.0
ERROR: Unhandled exception: <b>IOError</b>:IOError: disk I/O error
calibre 3.6 embedded-python: True is64bit: False
Windows-7-6.1.7601-SP1 Windows ('32bit', 'WindowsPE')
32bit process running on 64bit windows
('Windows', '7', '6.1.7601')
Python 2.7.12+
Windows: ('7', '6.1.7601', 'SP1', u'Multiprocessor Free')
Interface language: None
Successfully initialized third party plugins: DeDRM (6, 5, 4) && Count Pages (1, 8, 0) && KoboTouchExtended (2, 8, 2) && Kobo Utilities (2, 5, 2) && Diaps Editing Toolbag (0, 3, 5) && Quality Check (1, 9, 11) && Modify ePub (1, 3, 13) && Reading List (1, 6, 6)
Traceback (most recent call last):
File "calibre_plugins.koboutilities.action", line 1604, in vacuum_device_database
File "calibre_plugins.koboutilities.action", line 3306, in _vacuum_device_database
File "c:\t\t\apsw-9hooel\apsw-3.13.0-r1\src\cursor.c", line 236, in resetcursor
IOError: IOError: disk I/O error
And two minutes later, after disconnecting, rebooting, reconnecting, scanning and fixing the H202, opening Calibre and compressing the database a second time, everything worked perfectly.