I/O error when trying access to the XBMC database files

[kraleksandr]

Code:

xbian@xbian ~ $  cp .xbmc/userdata/Database/MyVideos75.db /dev/zero
cp: reading `.xbmc/userdata/Database/MyVideos75.db': Input/output error
cp: failed to extend `/dev/zero': Input/output error

What does it mean? My SDcard becomes broken or what?

First I installed nmap with 69 additional packages, then I tried to remove nmap but apt-get said that 'package list parse error'.
Then I sent 'reboot' to my Pi and after that my media library has gone.
I then remove this packages (nmap+69 additionsl) using dpkg -r but I/O error still appear.

Code:

xbian@xbian ~ $  ls -al .xbmc/userdata/Database/
total 2068
drwxr-xr-x 1 xbian xbian    160 Jul 25 07:28 .
drwxr-xr-x 1 xbian xbian    356 Jul 15 10:10 ..
-rw-r--r-- 1 xbian xbian 606208 Jul 25 07:28 Addons15.db
drwxr-xr-x 1 xbian xbian      0 Jan  1  1970 CDDB
-rw-r--r-- 1 xbian xbian  28672 Feb 13 16:31 Epg7.db
-rw-r--r-- 1 xbian xbian 184320 Feb 13 16:31 MyMusic32.db
-rw-r--r-- 1 xbian xbian 819200 Jan  1  1970 MyVideos75.db
-rw-r--r-- 1 xbian xbian 417792 Jul 25 07:28 Textures13.db
-rw-r--r-- 1 xbian xbian  40960 Feb 13 16:31 TV22.db
-rw-r--r-- 1 xbian xbian  20480 Jul 20 18:30 ViewModes4.db