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How should I go about investigating seemingly high disk usage?

From time to time the whole system crashes too - I think the high HDD reads/writes might be to blame.

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You can monitor what programs are causing how much IO by running iotop.

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Turns out Tweetdeck, Firefox, Gwibber and Thunderbird are causing the most read/writes. I had apt-get remove'd gwibber though - not sure why that's still showing up. – AFD Apr 29 '11 at 21:04
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You might want to too look at the disk utility and take a look at the SMART Data, this gives you a good overall view of how healthy your disk is/isn't. enter image description here

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Thanks. I had done short scans before and it came back fine. Just did a full test and still everything fine. Think it was just too much multitasking. – AFD Apr 29 '11 at 21:04
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