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 | | Tape Drives: Still the Preferred Media for Data BackupsDespite all their features, however, hard disks are still machines invented by humans. They have a fixed life span after which there is a danger that they may go down anytime. This period is typically anywhere between three to five years. If a hard disk crashed due to any number of reasons hardware or software errors or natural or man-made disasters it can be catastrophic. All the data that you have stored on the disk can instantly become inaccessible and out of bounds. Total data loss causes many companies to fail each year as they cannot cope with the consequences they lose access to all their records and information and there are massive financial losses.
Therefore, the importance of taking regular data backups just cannot be over-emphasised. A variety of data backup media exist in the market, such as CDs, DVDs, USB drives and portable hard disks. However, the media that remains the most popular and effective for taking backups by companies is the tape drives. Just like hard drives rule in the world of primary storage for computers, tape drives rule the data archive market.
What are tape drives actually? Simply put, a tape drive consists of a large length of tape that is coated with a magnetic material, much like the platters of a hard disk carry a magnetic coating. This tape is wound around a couple of spools and the entire thing is enclosed in a plastic cartridge. The tape drive has a read / write head that is stationary and remains fixed at one place.
Unlike in a hard drive where the spindles rotate at the same place while the read / write head moves all over, in a tape drive it is the tape that has to move back and forth in front of the stationary head so that it can access data for writing, rewriting and deleting or saving. This kind of data access is called sequential access as the data can be only read strictly in sequence.
Tape drives use old technology of recording data, exactly like audio or video cassettes of yore. However, they are still quite popular and remain the best option for archiving a huge amount of important data. There are many reasons for this. For one, tape cartridges are quite cheap and easily available. No other data storage media can match the cost they offer in terms of per MB of storage.
The sequential data access has its benefits, even though the entire tape has to move back and forth before you can access a particular file. If a part of the tape gets corrupted, the entire data is not affected. You just have to cut that exact portion of tape, glue the ends together and you have the tape running again, offering you access to the rest of the data. Another benefit is that the tape cartridge that stores the data exists separately from the tape drive. In a hard disk, since the data-holding platters are built into the drive, any power surge can wipe out all the data.
A tape cartridge on the other hand has no parts through which electricity flows. In case of a lightning strike or power spike, only the tape drive is damaged, while the tape cartridge that stores the data remains safe and intact. It is easy to take a lot of tapes and store them in a safe place away from the computers. They are quite small and can be easily transported.
Data backup media has advanced in the last few years and has made rapid strides in terms of storage space. However, nothing can still come close to tape drives for the combination they offer of reliability and low cost for archiving a large amount of data for a long time. |
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| The Hundred-Year Lie: How to Protect Yourself from the Chemicals That Are Destroying Your Health
by Randall Fitzgerald |  | In the tradition of Silent Spring and Fast Food Nation, investigative journalist Randall Fitzgerald warns how thousands of man-made chemicals in our food, water, medicine, and environment are making humans the most polluted species on the planet. A century ago in 1906, when Congress enacted the Pure Food and Drug Act, Americans were promised "better living through chemistry." Fitzgerald provides overwhelming evidence to shatter this myth, and many others perpetrated by the chemical, pharmaceutical, and processed foods industries.
Plume (June 26, 2007)
Product Dimensions: 8.4 x 5.2 x 0.7 inches
Paperback: 304 pages | Consider This:- The average American carries a "body burden" of 700 synthetic chemicals
- Chemicals in tap water can cause reproductive abnormalities and hermaphroditic birth
- A 2005 study of lactating women in eighteen U.S. states found perchlorate (a toxic component of rocket fuel) in practically every mother's breast milk
- Lab tests have found that four common food additives-aspartame, MSG, and two coloring chemicals-interact synergistically to produce nerve damage. These additives are commonly found in junk food marketed to children.
- In the past few decades male sperm counts fell by 50 percent, women's tubal pregnancies increased by 400 percent, and girls eight years old and younger began experiencing puberty. Chemicals are redefining what is "normal"
| Editorial Review:
In 1906, Congress passed the US Food and Drug Act and, according to the author, this has led to the "Hundred-Year Lie" that our food and drugs have been investigated and are safe and that the additives and chemicals put in them may actually make them better than the organic, natural variety. As an investigative reporter, Fitzgerald is expert at using scientific documents, articles in science and environmental journals and expert interviews to support his case. He concludes that we cannot rely on the government, science or manufacturers to either protect us or predict the effects of the products we ingest. As a test, Fitzgerald had his own blood analyzed for toxins and, in spite of living in an area of California known for its pure water and air and careful eating habits, he was shocked to find many toxic chemicals in his blood. While many readers will not agree with his conclusion that "Merely by choosing a diet of pure foods and a lifestyle free of synthetics, we can detoxify ourselves and initiate the healing of many degenerative illnesses and diseases," this book will cause any reader to think about the effect of our own voluntary actions on the health of our bodies. His suggestions for practical steps one can take may prove useful as well, although in the paperback afterword, he fears that denial will prevent most people or governments from taking any significant action.
Reviewer: Nola Theiss (Vol. 42, No. 1) |
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