I got the same problem after update to Quantal from 12.04
--- [ 871.923526] end_request: I/O error, dev fd0, sector 0 [ 871.923534] Buffer I/O error on device fd0, logical block 0 [ 894.603576] end_request: I/O error, dev fd0, sector 0 [ 894.603583] Buffer I/O error on device fd0, logical block 0 ---
And the i/o waiting time of the machine is always 30-40% and the machine load is 2-3 !!!
I got the same problem after update to Quantal from 12.04
---
[ 871.923526] end_request: I/O error, dev fd0, sector 0
[ 871.923534] Buffer I/O error on device fd0, logical block 0
[ 894.603576] end_request: I/O error, dev fd0, sector 0
[ 894.603583] Buffer I/O error on device fd0, logical block 0
---
And the i/o waiting time of the machine is always 30-40% and the machine load is 2-3 !!!