•Removable media—There is no way to evaluate the toughness of detachable media, including tape and laser written disks CD, DVD, Blu ray, WORM, etc. . There are too many variables. The basic way of trying out media is “elevated aging,” but only the long run will prove its accuracy.
There are no standards for exceptional, and it is difficult to unattainable to continually determine the ingredients and production processes that produced a cargo of disks. Controlled temperature and humidity affect the stability of a disk’s substrate and dyes, but garage atmosphere is barely half a disk’s life cycle. Even for a disk made of high first-rate parts, who can verify the circumstances and duration under which the disk was transported and warehoused before use?•Hardware obsolescence is obvious and visible to all who’ve reached maturity. Floppy disk drives 5. 25 in. or 3.
5 in. are challenging to find, to say not anything of players for ZIP, Jazz and other proprietary format media. In 1991, Sony marketed a 12 in. optical disk guaranteed to last 99 years. While the verity of that claim will be discovered in 2090, not even museums are more likely to have a suitable disk player.
•As operating approaches evolve, they have limited compatibility with their ancestors. Can a PC operating Windows 7 read files created under CP/M?Can today’s IBM Power System OS consistently extract files written on a s/38 from 1979 or a system/3 from 1969?•Application software turns into obsolete to boot. Consider the boneyard of former market leaders: VisiCalc, WordStar, Wang word processing and limitless others. Microsoft stopped supporting Office 97 about 10 years after its launch. •Output drivers—Retrieving old records also depends upon being capable of display and/or print content. Even with legacy CPUs, OSes and application program, the period screens, printers and the program that drives them may be unavailable or inoperable.
•Encryption and password defense—Long lived facts, including health records, often require security and privacy defense. Maintenance of passwords and decryption functions loom as extra impediments to the retrieval of old statistics. Options for long term preservationThere are at the least four viable options for keeping electronic data available over 25 to 100 years.