CD-R shelf life refers to the length of time that a recordable compact disc will remain viable once data has been burned onto it. Top manufacturers like Mitsui, Verbatim, Maxell, Memorex and
TDK claim that premium discs, with protective coating and special dyes, will last 50 or even 100 years.
Many industry experts, however, think that the unrecorded shelf life of a CD-R disc is more conservatively estimated to be between 5 and 10 years. One expert, from IBM, believes the number to be between 2 to 5 years.
The National Institute of Standards and Technology (NIST) published results of accelerated aging tests on CD-Rs and DVD-Rs in 2004. CD-Rs that used phythalocyanine dye and had a gold and silver alloy coating performed best. Overall, the study estimated that 13% of discs would
fail in 50 years, if the media was stored under normal office environmental conditions.
Once a disc is burned, a laundry list of factors affects how long stored data can be retrieved. These variables include:
* Media quality: All CD-Rs are based on a thin, polycarbonate base. Any wobble or imbalancing of the disc -- caused, for example, by an applied label or out of level workstation -- can negatively impact the burning process.
* The type of dye used to protect the underside of the disc: This factor makes the most difference to the shelf life of a disc because the effect of sunlight can seriously impair longevity.
* Method of storage: Keeping discs in sleeves or stored upright in jewel cases when not in a drive minimizes the possibility of scratching.
* Storage environment: The ideal temperature range is 41-68F, with humidity between 30-50%. Direct sunlight should be avoided at all times.
* Marking method: Only a felt-tip water based marker on the label side of the CD-R should be
used, ideally on the clear inner part near the center. Permanent markers (like "Sharpies") should be avoided. Paper labels should always be applied to the jewel case, never to the
disc itself. While manufacturers may sell circular adhesive labels that can be printed at the home or office, solvents in the paper, adhesives or inks can all degrade the disc. Uneven application of the labels can also cause the CD-R to wobble in high speed players, causing read/write errors or even damaging the player itself.
Many of the electrical products has gone wireless. Now there's wireless charging. Wireless charging is any of several methods of charging batteries without the use of cables or device-specific AC adaptors. Wireless charging can be used for a wide variety of devices including cell phones, laptop computers and MP3 players. There are three methods of wireless charging : inductive charging, radio charging and resonance charging.
sending unit. Another coil, attached to the device to be charged, is the receiver. Both coils are tuned to the same electromagnetic frequency, which makes it possible for energy to be transferred from one to the other.The method works over short distances (3-5 meters).
TDK claim that premium discs, with protective coating and special dyes, will last 50 or even 100 years.
used, ideally on the clear inner part near the center. Permanent markers (like "Sharpies") should be avoided. Paper labels should always be applied to the jewel case, never to the
If someone sent you an Excel or Words or Power Point files created using the newer version of Microsoft Office, version 2007, for sure you will not be able to open the file, if you are using Office 2000 or XP or 2003.
