A year ago I posted Optical Media Durability
Surprisingly, I'm getting good data from CD-Rs more than 14 years old,
and from DVD-Rs nearly 12 years old. Your mileage may vary.
It is time to repeat the mind-numbing process of feeding 45 disks through the reader and verifying their checksums. Below the fold, this year's results.
The fields in the table are as follows:
- Month: The date marked on the media in Sharpie, and verified via the on-disk metadata.
- Media: The type of media.
- Good: The number of media with this type and date for which all MD5 checksums were correctly verified.
- Bad: The number of media with this type and date for which any file failed MD5 verification.
- Vendor: the vendor name on the media
Surprisingly, with no special storage precautions, generic low-cost media, and consumer drives, I'm getting good data from CD-Rs more than 15 years old, and from DVD-Rs nearly 13 years old. Your mileage may vary.
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