You get the error message: Input/output error
This can be due to filesystem problems.
Unmounting and doing a check (fsck.ext2 or fsck.ext3) might help.
When you have a CD or DVD then the media might have problems. (e.g. scratches)
When you get the error by using dd
dd if=/dev/hda1|gzip -1 -v > backup-of-hda1.gz
Then you probably have problems with sectors on your disk. Most of the time you will find a device error in your syslog when this happens.
About the Author
Wim Peeters is electronics engineer with an additional master in IT and over 30 years of experience including time spent in support, development, consulting, training and database administration. Wim has worked with SQL Server since version 6.5. He has developed in C/C++, Java and C# on Windows and Linux in different European countries and different European languages. He writes knowledge base articles to solve IT problems and publishes them on the Lubby Knowledge Platform where he is one of the most important contributors and the main developer.