How to fix disk I/O error as the computer starts

Updated: 06/30/2020 by Computer Hope

A disk I/O error occurs any time the computer cannot read a diskette, disc, or other disk in the computer. Below are different recommendations to try before assuming the diskette, disc, or other disk is bad.

Floppy diskette, CD, or DVD in the computer

Computer CD-ROM

If you are attempting to boot the computer from a floppy diskette, CD (Compact Disc), or other disc follow the recommendations below. Make sure no floppy diskette or CD is in the computer since the computer may be trying to boot from a non-bootable disk, which may cause this error.

  1. Remove the floppy diskette or CD from the computer and put it back in and press any key to continue.
  2. Try rebooting the computer.
  3. Recreate the bootable diskette or CD you are attempting to boot since the disc may be bad. If using a blank CD or DVD (Digital Versatile Disc) that's not burned), try cleaning the disc. Make sure there are no smudges or fingerprints on the bottom of the disc.
  4. Try booting the diskette or disc in a different computer. If that computer can boot without the error, it is likely you have a problem with your drive.

No diskette or CD in the computer

If you have no diskette or CD in the computer and get Disk I/O errors on computer startup, it refers to your hard drive. Unfortunately, this is often an indication of a hard drive failure, follow the hard disk fail recommendations for additional steps in troubleshooting this issue.