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shock and Vibration tutorial 2.5", 3.5" and Compact flash drives

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  • shock and Vibration tutorial 2.5", 3.5" and Compact flash drives

    I had fun putting this together, hope other people find it useful. Covers the fun experinces I had selecting drives for my carputer.

    http://www.12vsystems.com/content/view/4/29/
    Spent all my money on carputers now I have to work a real job.
    http://www.858graphics.com

  • #2
    Compact Flash dies after 10,000 read/write cycles?
    True, didnít know this myself but I confirmed it with and FAE. I am looking for an explanation of why this happens
    Preface: I have done a lot of work with embedded systems with the system on a CF module.

    This is true, but not exactly correct. What actually happens is that individual "cells" of the memory die after SOMEWHERE around 10,000 write cycles. NOT read. You can read from a CF an infinite number of times. Writing is where you start ticking the death clock. Keep in mind though, just like bad blocks on a disk, the disk controller will cordon off those blocks and make sure they can't be used. If you have a system where your OS is on flash, try to make it read only. I doubt this is possible with Windows, but maybe. With Linux, its possible and should be done. Put temporary stuff that needs to be written like logs in a RAM disk.

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    • #3
      Take a look at EWF in the System Optimisation Forum ddn for info on how to make a disk read only within windows .... it works.

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      • #4
        Very cool page. Especially for the uninitiated. You do an excellent job explaining the basics of storage devices and the pictures are great. Thanks for all the work.

        Dave
        go to http://www.cartech.cc for more info about me and my rides.

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        • #5
          Thanks ddn

          Thanks for the info. I have updated the tutorial and added you to the list of resources


          Building systems requires so much knowledge it's hard to be an expert in any one field.
          Spent all my money on carputers now I have to work a real job.
          http://www.858graphics.com

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          • #6
            .

            SanDisk Extreme CF III is supposed to last 20,000 write cycles.

            Industrial version 200,000

            Edit: Check out nLited systems w/EWF and Minlogon (as said above) and Check out uDOC solid state storage.
            Progress [I will seriously never be done!]
            Via EPIA MII
            512MB RAM
            OEM GPS (embedded)
            nLite WinXP pro on
            1GB Extreme III CF card
            Carnetix 1260 startup/ DC-DC regulator
            Software: Still, re-Writing my existing front end in .Net

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            • #7
              So what did you end up using? A vertical mount /w shock abosrbed feet 3.5?

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              • #8
                What did we end up using

                The 3.5" Drives use about 15 watts more and places more load on the DC to DC converter. We used the 2.5" drives allowing the system to run cooler. As long as your using a good power supply (Not the 60w morex) you can use the 3.5" you might want to add some extra fans.
                Spent all my money on carputers now I have to work a real job.
                http://www.858graphics.com

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