Erasing all data on a BizHub C451 Digital Copiers Hard Disk

26 May

We have a Konica-Minolta Bizhub C451 Printer Copier and it’s just about at the end of it contract and will soon be heading back to KM.

I recall seeing a CBS video on the tube a while back about the potential security issues with digital printer copiers and information being stored on the hard disk inside it. I’m always conscious that data on a computers hard disk can fairly easily be recovered so I quite often use tools like Darik’s Boot and Nuke to destroy all data on old disks before re-using them. But, it hadn’t really crossed my mind that the same would need to be done on copiers. Watch this video, it’s pretty interesting.

The C451 user guide can be found here but it’s not that useful for the advanced functions. The box guide can be found here and contains much more of the technical detail.

If you skip to page 232 you will see all the information you need about how to overwrite data on the disk, it’s pretty straight forward. The only real choice you have is which mode to select when overwriting, these are the options:

  • Mode 1: Overwritten with 0x00
  • Mode 2: Overwritten with random 1-byte numbers % Overwritten with random 1-byte numbers % Overwritten with 0x00
  • Mode 3: Overwritten with 0x00 % Overwritten with 0xff % Overwritten with random 1-byte numbers % Verified
  • Mode 4: Overwritten with random 1-byte numbers % Overwritten with 0x00 % Overwritten with 0xff
  • Mode 5: Overwritten with 0x00 % Overwritten with 0xff % Overwritten with 0x00 % Overwritten with 0xff
  • Mode 6: Overwritten with 0x00 % Overwritten with 0xff % Overwritten with 0x00 % Overwritten with 0xff % Overwritten with 0x00 % Overwritten with 0xff % Overwritten with random number
  • Mode 7: Overwritten with 0x00 % Overwritten with 0xff % Overwritten with 0x00 % Overwritten with 0xff % Overwritten with 0x00 % Overwritten with 0xff % Overwritten with 0xaa
  • Mode 8: Overwritten with 0x00 % Overwritten with 0xff % Overwritten with 0x00 % Overwritten with 0xff % Overwritten with 0x00 % Overwritten with 0xff % Overwritten with 0xaa % Verified

I went with Mode 2 as it seemed to be more than sufficient for my needs.

Anyway, that took about a couple of hours to complete and that should have been all there was to it, except it wasn’t. When machine rebooted, I got the service error C-D010 and it was stuck at that screen, even after a few reboots.

So, after a bit of Googling I found the field service manual. If you skip to page 322, you will see the information on how to fix this error.

First, enter the service menu. This is a hidden menu and you can access it by press to the following keys in this order:

  1. Utility/Counter (Hard Key)
  2. Check details (Soft Key)
  3. Stop key (Hard Key)
  4. 0 (Hard Key)
  5. 0 (Hard Key)
  6. Stop key (Hard Key)
  7. 0 (Hard Key)
  8. 1 (Hard Key)

Once into the service menu, you then need to do a physical format of the disk, and then a logical format.

Press the soft keys in the following order:

  1. State Confirmation
  2. Memory/HDD Adj
  3. HDD Format

Then select physical format and proceed. Once that is done, turn the main power switch off and then on and do the same again, but this time select logical format. This time it is fixed, and that’s all there is too it, still much easier than dismantling the machine to take out the drive.