BUG #4601: Data saving and opening problem

The following bug has been logged online:

Bug reference: 4601
Logged by: V KUMAR
Email address: kumarv(at)nic(dot)in
PostgreSQL version: 8.1.4
Operating system: linux
Description: Data saving and opening problem
Details:

we are experiencing the following error intermittenly in saving and opening
the data.

While saving:

Database error: Error in saving the FMB MAP(Tippan). An I/O error
occured while sending to the backend.

While opening:

Database error: Error opening FMB Map of 2808060345. An I/O
error occured while sending to the backend.

If we delete the record '2808060345', it shows error in another record and
goes on. The database was working perfectly earlier.