I was trying to install an app through Preware yesterday and it failed. Looking at the ipkg log I see that I received a "No space left on device error". I don't know exactly how to fix this and searching the forums don't see a solution other than to Doctor. I'm hoping someone else has a better suggestion.

I know my way around a command-prompt but my linux experience is very limited, especially when it comes to managing disk space. Even though I don't think I really have that many apps installed, I don't really know how much space any of them take up either so I deleted a few and tried again... same error. Running df -h made it clear what volume has the problem - /dev/mapper/store-root (shown below.) Any suggestions on how to correct the error, or at least know how to figure out what's taking up all the space on the full volume?

Thanks for your help!

Code:
Filesystem                           Size      Used Available Use% Mounted on
/dev/root                           31.0M     19.1M     11.9M  62% /boot
/dev/mapper/store-root       441.7M    441.7M     32.0K 100% /
/dev/mapper/store-root       441.7M    441.7M     32.0K 100% /dev/.static/dev
tmpfs                                  2.0M    196.0K      1.8M  10% /dev
/dev/mapper/store-var      62.0M     19.1M     42.9M  31% /var
/dev/mapper/store-log      23.2M     12.6M     10.6M  54% /var/log
tmpfs                                32.0M      1.1M     30.9M   3% /tmp
tmpfs                                16.0M     56.0K     15.9M   0% /var/run
tmpfs                                32.0M     12.0K     32.0M   0% /var/tmp
tmpfs                              246.4M         0    246.4M   0% /media/ram
/dev/mapper/store-media
                                          13.8G      7.3G      6.5G  53% /media/internal
cryptofs                             13.8G      7.3G      6.5G  53% /media/cryptofs
/dev/mapper/store-cryptodb
                                        135.0M     40.1M     94.9M  30% /var/db
/dev/mapper/store-cryptofilecache
                                        127.5M     91.4M     36.1M  72% /var/file-cache
tmpfs                                 32.0M      1.1M     30.9M   3% /proc/sys/net/ipv4/ip_forward
/dev/loop0                       124.0M     96.4M     21.1M  82% /opt