186 lines
3.4 KiB
HTML
186 lines
3.4 KiB
HTML
<HTML
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><HEAD
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><TITLE
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>Physical devices</TITLE
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><META
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NAME="GENERATOR"
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CONTENT="Modular DocBook HTML Stylesheet Version 1.7"><LINK
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REL="HOME"
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TITLE="USB Flash Memory HOWTO"
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HREF="index.html"><LINK
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REL="PREVIOUS"
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TITLE=" Purpose"
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HREF="purpose.html"><LINK
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REL="NEXT"
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TITLE=" Buying a memory stick"
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HREF="buying.html"></HEAD
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><BODY
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CLASS="sect1"
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BGCOLOR="#FFFFFF"
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TEXT="#000000"
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LINK="#0000FF"
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VLINK="#840084"
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ALINK="#0000FF"
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><DIV
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CLASS="NAVHEADER"
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><TABLE
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SUMMARY="Header navigation table"
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WIDTH="100%"
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BORDER="0"
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CELLPADDING="0"
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CELLSPACING="0"
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><TR
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><TH
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COLSPAN="3"
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ALIGN="center"
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>USB Flash Memory HOWTO</TH
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></TR
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><TR
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><TD
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WIDTH="10%"
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ALIGN="left"
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VALIGN="bottom"
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><A
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HREF="purpose.html"
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ACCESSKEY="P"
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>Prev</A
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></TD
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><TD
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WIDTH="80%"
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ALIGN="center"
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VALIGN="bottom"
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></TD
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><TD
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WIDTH="10%"
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ALIGN="right"
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VALIGN="bottom"
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><A
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HREF="buying.html"
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ACCESSKEY="N"
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>Next</A
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></TD
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></TR
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></TABLE
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><HR
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ALIGN="LEFT"
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WIDTH="100%"></DIV
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><DIV
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CLASS="sect1"
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><H1
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CLASS="sect1"
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><A
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NAME="physical"
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></A
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>2. Physical devices</H1
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><P
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> Flash memory devices come mainly in the form of small, portable
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devices often referred to as <EM
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>memory sticks</EM
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> or
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<EM
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>keychains</EM
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>, and as part of digital
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cameras. They are <EM
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>non-volatile devices</EM
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> which
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operate on the principle that electric charges are used to
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represent data in binary format. These charges can remain
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unchanged almost indefinitely, but changes (such as writing to the
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device) limit the life span of the device (100000 writes of 8MB
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each).
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</P
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><P
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>
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Memory sticks plug directly into a USB-port at the back of your
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computer. The power it needs is supplied by the USB-port. It is
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sometimes convenient to use a USB-extension cable to bring the
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device within easy reach.
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</P
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><P
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> Memory sticks usually have <EM
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>write protect
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switches</EM
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> which should be turned off if you want to use
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it as read-write device. If the switch is in the <SPAN
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CLASS="QUOTE"
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>"on"</SPAN
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> position,
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the device is <EM
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>read-only</EM
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>. The devices are
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usually equipped with a led (light emitting diode), which
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indicates that the device is operational. The led also flickers
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while data is being transferred to or from the device.
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</P
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><P
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> Digital cameras use flash memory for image storage. These are
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powered by the camera and connected to the computer's USB-port via
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an electronic interface. To be able to connect to the computer,
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the camera's power must be turned on for the duration of the
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interfacing, and should only be turned off after the device had
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been unmounted from the computer. It is important to remember that
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the device takes power from the camera's battery. The operation
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should therefore be terminated as soon as possible.
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</P
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></DIV
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><DIV
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CLASS="NAVFOOTER"
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><HR
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ALIGN="LEFT"
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WIDTH="100%"><TABLE
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SUMMARY="Footer navigation table"
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WIDTH="100%"
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BORDER="0"
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CELLPADDING="0"
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CELLSPACING="0"
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><TR
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><TD
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WIDTH="33%"
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ALIGN="left"
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VALIGN="top"
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><A
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HREF="purpose.html"
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ACCESSKEY="P"
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>Prev</A
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></TD
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><TD
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WIDTH="34%"
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ALIGN="center"
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VALIGN="top"
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><A
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HREF="index.html"
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ACCESSKEY="H"
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>Home</A
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></TD
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><TD
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WIDTH="33%"
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ALIGN="right"
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VALIGN="top"
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><A
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HREF="buying.html"
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ACCESSKEY="N"
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>Next</A
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></TD
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></TR
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><TR
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><TD
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WIDTH="33%"
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ALIGN="left"
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VALIGN="top"
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>Purpose</TD
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><TD
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WIDTH="34%"
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ALIGN="center"
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VALIGN="top"
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> </TD
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><TD
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WIDTH="33%"
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ALIGN="right"
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VALIGN="top"
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>Buying a memory stick</TD
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></TR
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></TABLE
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></DIV
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></BODY
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></HTML
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> |