The National Science Fair

Removable Disks

So, let BACKUP. This is called “passive security measures” and is to make regular copies of our files on other media types. There are several options on the market and the choice will depend primarily on the amount of data we need to store and the cost of such media. – CDROM a good system for personal users, it is cheap and can store 600 MB for standard media. – Unlike the CDROM CDRW can be recorded and erased a large number of times but given the low cost of the CDROM should consider whether it is worth. – Removable Disks (mixed ability) – magneto units, can store 900 MB.

– DAT tapes that can store between 2 and 4 GB. – DLT tape between 20 and 40 GB. – ZIP Drives up to 250 MB. The choice of any system as we have said depends on our needs but we must take into account something very important, durability and handling of the medium we choose. CD-ROMs are reliable means of emulsion but open. Although it is protected by a layer of plastic is susceptible to scratches that can render them unfit. In addition, chemical emulsions which are made in time decompose destroying data. Although at this point there is still no exact criterion of time, we can speak of a minimum of 30 years.

An additional advantage of the CDROM is the immediate access to data stored in it, unlike tape systems that need to be overturned first. Magneto-optical drives are very safe and a useful life exceeding rest, data in this support are recorded by “burning” of the emulsion, it is heated to a temperature determined to be recorded and subsequently cools, this system resulted in an application in the audio world with the creation by SONY Mini-Disc which is very small magneto-optical media capable of supporting more than one hour of audio. This support, as a means “non-magnetic, is not affected by magnetic fields as in the case of the tapes. The emulsion is usually protected within a housing. The tapes are so durable but can also magnetic side effects if they are stored for a long time in places not conducive, especially in terms of temperature conditions are concerned. The tapes need to be recorded for special software, it would take to return to retrieve the information. It is very important to use in these cases widespread recording programs that allow a wide compatibility with other systems and users, and that they have a good support at the time. ZIP drives can maintain folder hierarchies, add password protection and store a large number of files in one file taking up much less space than the original. ‘.