Macbook pro changes to read-only?

My roommate has a mid 2008 15" macbook pro and everything was going fine with it until 2 weeks ago, when it wouldn't boot. So I reformatted and clean installed Snow Leopard and migrated his files using Migration Assistant and everything seemed fine until 2 days later and he couldn't save anything from any program because it said there was not enough free space to save, however Get Info says there is 180gb remaining on his 250gb drive. So again I reformatted by zeroing-out the data to remove any bad sectors in the drive and reinstalled snow leopard. This time I didn't use migration assistant because it seemed like his previous file system could be corrupt. We could save and there were no problems until the next morning, and we get errors when trying to save a document that say "there is not enough free space", but again get info on the hard drive shows 230gb of free space). The computer functions normally, but it won't index itself or save files from Safari, Office, iLife, etc.
It seems like this drive goes to read only because we cannot save. We are going to try another hard drive, but I was wondering if any of you guys have ever seen this issue? Could it possibly be a bigger issue than a hard drive that it only a year and a half old?
Any help is appreciated,
Brendan
Message was edited by: BJGPP

Not sure without more info(console log messages, smart status, system profiler info)but it sounds as if you may have a failing Hard Drive, if you had another drive that would be the best way to test. Good Luck

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