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so in the event of a full hardware failure, all of your data could still be lost unless it is stored safely offsite on a tape or CD-ROM To circumvent concurrent drive corruption at the end of a disk s life, many administrators use drives of equivalent capacities from different manufacturers, some new and some used, in a RAID array This ensures that drives are least likely to fail concurrently RAID Levels 0 and 1 are most commonly used RAID Level 0 involves parallelizing data transfer between disks, spreading data across multiple drives, thereby improving overall data transmission rates This technique is known as striping However, while RAID Level 0 can write multiple disks concurrently, it does not support redundancy, which is provided with RAID Level 1 This level makes an identical copy of a primary disk onto a secondary disk.

This kind of mirroring provides complete redundancy: if the primary disk fails, the secondary disk is able to provide all data contained on the primary disk Because striping and mirroring consume large amounts of disk space, they are costly to maintain per megabyte of actual data Thus, higher RAID levels attempt to use heuristic techniques to provide similar functionality to the lower RAID levels, while reducing the overall cost For example, RAID Level 4 stores parity information on a single drive, which reduces the overall amount of disk space required but is more risky than RAID Level 1 Software RAID solutions typically support both striping and mirroring This speeds up data writing and makes provisions for automating the transfer of control from the primary disk to the secondary disk in the event of a primary disk failure.

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In addition, many software solutions support different RAID levels on different partitions on a disk, which may also be useful in reducing the overall amount of disk space required to store data safely For example, while users might require access to a fast partition using RAID Level 0, another partition may be dedicated to a financial database that requires mirroring (thus RAID Level 1) Sun s DiskSuite product is currently one of the most popular software RAID solutions Alternatively, custom hardware RAID solutions are also proving popular, because of the minimal administrative overhead involved with installing and configuring such systems While not exactly plug and play, external RAID arrays such as the StorEdge A1000 include many individual disks that can be used to support both mirroring and striping, with data transfer rates of up to 40 Mbps.

In addition, banks of fast-caching memory (up to 80MB) speed up disk writes by temporarily storing them in RAM before writing them to one or more disks in the array This makes the RAID solution not only safe but significantly faster than a normal disk drive..

CD writing and rewriting devices are rapidly gaining momentum as desktop backup systems that are cheap, fast, and, in the case of CD-RW, reusable. CD-R and CD-RW devices are reviewed in 14. These devices serve two distinct purposes in backup systems: while CD-RW discs are useful for day-to-day backup operations because they can be reused, CD-R technology is more useful for archiving and auditing purposes. For example, many organizations outsource their development projects to third-party

Part IV:

Well, all Evil Geniuses should be trying to form a balanced view of the arguments in the world they are trying to conquer Let s take a look at the flip side of biofuels and assess why, maybe, they aren t going to save the world Biofuels have an important role to play while we look for medium-term solutions to our energy problems In the longer term, technologies such as the hydrogen economy and hydrogen fuel cells, could potentially meet our energy needs However, in the short term, we need to look for transitional solutions that will allow us to shift from our dirty technologies, to more environmentally responsible technologies Biofuels have a part to play in this transition However, if we look at trying to meet all of our energy needs from biofuels, it becomes apparent that growing energy may not be desirable on a large scale.

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