HOME
Subscribe to RSS FeedHow long does a CD live ?
Because I'm saving all my memories on CD's and DVD's
my honeymoon and birth of my son ,,
and I'm afraid that after some time it won't be able to be read ..!
also I think a hard disk and a flash memory also don't live long because it may get a virus and I'll lose all the data :(
Please tell me :)
Hope this helps!
The life span of a written disc depends upon a number of factors including such things as the intrinsic properties of the materials used in the discâ ™s construction, its manufactured quality, how well it is recorded and its physical handing and storage. As a result, the life span of a recorded disc is extremely difficult to estimate reliably. However, to calculate disc life spans within some practical timeframe blank media manufacturers do conduct accelerated age testing by subjecting samples of their discs to environments much beyond those experienced under normal storage conditions. Generally speaking, only the effects of varying temperature and humidity are considered. These test results are then used to predict how long a disc will remain readable under more normal storage conditions. Since questionable testing and measurement procedures can seriously impact upon and compromise these estimates several international standards have been developed which specify procedures to be used conducting accelerated testing and analyzing the resulting data from prerecorded (pressed) and recordable CDs:
ISO 18921:2002, Imaging materials â ” Compact discs (CD-ROM) â ” method for estimating the life expectancy based on the effects of temperature and relative humidity
ISO 18927:2002, Imaging materials â ” Recordable compact disc systems â ” method for estimating the life expectancy based on the effects of temperature and relative humidity
For years now many media manufacturers have performed their own lifetime evaluations using these or a variety of other homegrown tests and mathematical modeling techniques. Historically, manufacturers have claimed life-spans ranging from 50 to 200 years for CD-R discs and 20 to 100 years for CD-RW. Be aware, however, that disc producers, manufacturing methods and materials change over time as do applications and cost imperatives. Consequently, those concerned with disc longevity should consult the appropriate international standards and their media manufacturer for more particular information.
It is important to remember, however, that nothing lasts forever and that technologies inevitably change. Well-designed products, such as CD-R and CD-RW, allow for seamless transition to the next generation and ultimately, since they embody digital information, contents can be transferred to future storage systems as becomes necessary to preserve whatever has been stored on the discs.
If you are keeping them in CD/DVD storage box with temperature control, it can last for easily more than 50 years. This boxes are costly though but never too costly than important & great memories!
On a average, under normal storage, it can last for 25 years. Make sure you perform regular maintenance, like cleaning it with recommended chemicals for CD/DVD. Handle it with care is important but at times, the damage laser head from your CD/DVD ROM may cause some harm without you knowing.
Hence, it's advisable to have duplicate copies of CD/DVD & also a copy in external hard disk drive. View this as an investment rather than cost if those pictures & documents means a lot to you.
Good luck!
Hope this helps.
and virus thing effects the system not a cd
#If you have any other info about this subject , Please add it free.# |
