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DVDs are quite stable, and if they are treated well, they usually will last longer than the person who buys them Estimating the lifetime of a storage medium is a very complex process that relies on simulated aging and statistical extrapolations Based on accelerated aging tests and past experience with optical media, the general consensus is that replicated discs will last anywhere from 50 to 300 years DVD-R discs are expected to last from 40 to 200 years, about as long as CD-R discs2 Shelf life before recording is about 10 years The primary factor in the lifespan of DVD-R discs is aging of the organic dye material, which can change its absorbance properties Long-term storage of DVD-Rs should be in a relatively dark environment, since the dyes are photosensitive, especially to blue or UV light (both of which are present in sunlight) Cyanine media are more susceptible than phthalocyanine media There are anecdotal reports of CD-R and DVD-R discs wearing out after being played for long periods of time, ostensibly because of alteration in the dye caused by reading it with a laser, but there are counterreports of discs that play 24 hours a day in kiosk installations for months or years without a hitch The erasable formats (DVD-RAM, DVD-RW, and DVD+RW) are expected to last from 25 to 100 years The primary factor in the lifespan of these discs is the chemical tendency of the phase-change alloys to separate and aggregate, thus reducing their ability to hold state This also limits the number of times a disc can be rewritten For comparison, magnetic media (tapes and disks) last 10 to 30 years; high-quality, acid-neutral paper can last a hundred years or longer; and archival-quality microfilm is projected to last 300 years or more Note that computer storage media usually become technically obsolete within 20 to 30 years, long before they physically deteriorate In other words, before the discs become nonviable, it will become difficult or impossible to find equipment that can read them As discussed earlier under Bonding, DVDs may be subject to laser rot oxidation of the reflective layer Normally, laser rot is not visible, although there have been a few anecdotal reports of cloudiness in discs that correlates with playback errors Media types such as dual-layer discs and DVDRs that use gold for the reflective layer are not susceptible to oxidation because gold is a stable element.

2 Kodak officially states that its CD-R media will last 100 years if stored properly Testing by Kodak engineers indicates that 95 percent of the discs should last 217 years

Information has been obtained by Osborne/McGraw-Hill from sources believed to be reliable However, because of the possibility of human or mechanical error by our sources, Osborne/McGraw-Hill, or others, Osborne/McGraw-Hill does not guarantee the accuracy, adequacy, or completeness of any information and is not responsible for any errors or omissions or the results obtained from use of such information

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DVD-ROM, DVD-R Ambient Temperature Storage 20 to 50 C ( 4 to 122 F) 15 C (59 F) per hour 10 C (50 F) per hour 15 C (59 F) per hour 5 to 90% Maximum Variation Relative

10 to 50 C (14 to 122 F)

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assword security is one of the most important security measures to implement for your Linux system Without strong password security, your system will never be safe A hacker who manages to compromise a firewall (see 13) can attempt to log in as a user and gain access to machines on the network However, if all your users have strong passwords, you stand a good chance of foiling the hacker s illegal attempts to break into your network This chapter describes how passwords work, what hackers try to do to crack them, and what measures you can take to protect yourself

< xml version="10" encoding="UTF-8" > Page xi ABAP Queries First Steps Part 1: Creating an ABAP Query Step 1: Creating the User Group Step 2: Creating the Functional Area Step 3: Assign the User Group to the Functional Area Step 4: Creating the Query Part 2: Using an ABAP Query Step 1: Selecting the User Group Step 2: Selecting the Query Step 3: Using the Query New Fields in Pricing Adding the Field to KOMK and KOMP Writing the ABAP Code Sundry Tips 467 468 469 469 470 475 476 479 480 480 481 482 482 483 484 487 495

3 to 85%

Linux passwords are stored on the machine in encrypted form Encryption involves converting a text string, based on a repeatable algorithm, into a form that is very different from the original string The algorithm must be repeatable so that when you log in, Linux can take your password and reproduce the encrypted form that it stores For instance, if your password is

10 to 55 C (14 to 131 F)

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