We were asked the other day about the advantages and disadvantages of CD-R or DVD recordable disc.
This certainly is not an easy answer with all the various types of data storage available today.
CD-R and DVD-R and DVD+R are 'Write Once, Read Many' formats. This capability is called "WORM' for short.
This means you can only write to the disc once (or in multi-session several times to different locations on the disc before finalizing).
This is unlike other formats used for hard drives, flash memory, backup tape and certain optical formats like the +RW and -RW in DVD recordable that can be erased and re written hundreds or millions of times (in disc based hard drives).
A CD-R or recordable DVD provides an "archive", or permanent record of the data copied. That is it's main advantage over all other types of data storage.
Disc longevity compliments the WORM feature by protecting the data for 100 years or more. This is where a quality disc surpasses the bargain disc. Bargain discs life span can be in days instead of years.
The disadvantages of recordable discs are numerous.
- WORM discs are permanent
- Optical discs require special drives to read/write.
- Optical storage does not provide enough data storage in comparison to other storage technologies
- Optical storage is expensive per GB/TB in comparison to other technologies including disruptive formats that offer convenience over cost.
- Optical storage rewritable formats suffer from compatibility issues between drives.
- Consumer based formats like CD-R and DVD-R, BD-R do not have a formal method of grading quality of discs. There are no standards for longevity tests.
Optical discs like CD-R, DVD-R DVD+R and BD-R provide an excellent method of storing data that will not change. Your family pictures and records for instance, or your business records and asset photos or videos.