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diff --git a/docs/mediacheck.txt b/docs/mediacheck.txt new file mode 100644 index 0000000..d320977 --- /dev/null +++ b/docs/mediacheck.txt @@ -0,0 +1,25 @@ +Mediacheck documentation +October, 2008 + + +Mediacheck is a tool we use to test the integrity of ISO images. The +ISO9660 specification allows for a 512 byte region which is for +application use. We use it to store a checksum of the ISO image. Of +couse putting the checksum into this region will change the checksum +of the final ISO image, so when we verify the checksum later we have +to fill in this 512 region with the original contents before the +implantation. It is set to all ASCII 32 decimal spaces. + +If you have a set of ISO images you can implant the checksum data with +this command: + + implantmd5iso <isoname> + +NOTE: You cannot re-implant an ISO once its been implanted. + +To check a ISO image you can use this command line: + + checkisomd5 <isoname> + +The tools are in the isomd5sum package. + |