[ubuntu] Everytime File System becomes read-only

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http://ubuntuforums.org – I am using Ubuntu 12.04. Initially few days, everything worked fine, but then I started getting a problem quite frequently. After every 2-3 days, the file system becomes read-only. I am unable to save/download anything in the installation drive and the system hangs if I attempt to do so, after which I need to force restart. I have to run fsck in the repair mode to get it fixed. There I get the following messages: "Inodes that were part of a corrupted orphan linked list found. UNEXPECTED INCONSISTENCY: RUN FSCK MANUALLY. fsck / [886] terminated with status 4. Filesystem has errors: /& (Hardware)