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Table Of Contents  CertiGuide to Security+
 9  Chapter 3:  Infrastructure Security (Domain 3.0; 20%)
      9  3.2  Media
           9  3.2.4  Removable Media

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3.2.4.4  Diskettes
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3.2.4.6  Smartcards
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3.2.4.5  Flashcards
(Page 1 of 3)

A media technology that has been rapidly gaining in popularity for electronic devices like PDA’s, MP3 players and digital cameras, as well as for data exchange among computers, is the flash memory card, or “flashcard” (not to be confused with the very-low-capacity media you might have used in 2nd grade to learn math).

Figure 33: The extremely small size of SmartMedia makes taking a huge amount of data very easy to transport without being noticed.

 


Flashcards offer “persistent” memory, sort of a cross between the no-moving-parts attribute of RAM and the ability to maintain data even without a continuous supply of power offered by magnetic and optical media.

[spacer]Flash Card Types

A number of different types of flashcards are in common use today, including:

1. Compact Flash (CF)

2. Smart Media (SM)

3. Memory Stick (MS)

4. Multi-Media Card (MMC)

5. Secure Digital (SD)

6. XD-Picture Card


Flashcards are a convenient way to transport large amounts of data in a very small space, usually without worrying about format issues. For example, a CF card written by a digital camera can usually be popped into an adapter on a desktop, and read, as if it were a CD or floppy. Additionally, flash memory cards are more durable than most media, even diskettes, thus making them useful for transporting data. Since they are solid-state devices, there’s no mechanical wear and tear, and unlike optical media, no concern about scratching. The main disadvantage to this type of media is high cost (hundreds of dollars for a card which stores less than a CD-R, for example).

[spacer]Flash Card Storage

Capacities offered by these cards are constantly growing. For example, CF cards are up to 1 GB. In terms of CF, be aware that there are both Type I and Type II cards. If you have an older device that accepts CF, you may not be able to use Type II devices such as the “micro-drive”, which is really a miniature hard drive in a CF form factor, not a true CF technology device. CF is very similar to PCMCIA, so a CF card can be used in a standard notebook PCMCIA slot with the simple addition of a 50-pin to 68-pin adapter.



Previous Topic/Section
3.2.4.4  Diskettes
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23
Next Page
3.2.4.6  Smartcards
Next Topic/Section

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