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URL: http://www.berklix.com/~jhs/seismik/

2 Convoys of big seismic vibrator trucks are shaking through Munich in August 2012, What if any risk to computer disks ?
Archives of mail lists for follow up: Odds

millimetres per second per second acceleration, but produces What G Force ?

  • DIN standard quotes in millimetres per second acceleration.
  • http://www.bulkhandling.com.au/pdfs/7-Aspec-PDF.pdf Re. DIN 4150
    The German standard DIN 4150 Part 3 provides vibration velocity guidelines for use in evaluating the effect of vibration on structural integrity (see Table 1).
    ... For continuous long-term vibration, 5 mm/s peak vibration velocity is seen as a safe limit for structural integrity in domestic buildings.
  • Disk manufacturers quote in G (gravitation force), typically from a sudden deceleration dropping, or knocking.
  • Disk Specifications:
    1000 GB Samsung HN-M101MBB 9.5mm high
    http://www.tomshardware.com/reviews/advanced-format-1tb-hard-drive,3046-3.html
    
    http://www.storagereview.com/samsung_spinpoint_m8_review
    Liner Shock(1/2 sine pulse) / Operating 325 G Liner Shock(1/2 sine pulse) / Non-operating 750 G Vibration / Operating 1 .5 Grms

    60 GB Toshiba MK6021GAS 2.5-inch laptop
        Vibration and Shock:
        Operating Vibration     9.8 m/s^2 (1.0G), 5 - 500 Hz
        Operating Shock         200g
        Non-Operating Shock     800g
    

    4 GB Maxtor 84000a6
        Shock & Vibration (typical):
            Operating Shock ........................ 20  Gs, 2ms (no errors)
            Non-Operating Shock .................... 150 Gs, 2ms (no damage)
            Operating Vibration (without non-recoverable errors)
             Per MIL-STD-810E Method 514.4
              10Hz ................................. 0.0125   G^2/Hz
              40Hz ................................. 0.0125   G^2/Hz
             500Hz ................................. 0.000125 G^2/hz
             Per MIL-STD-810E Method 514.4
              Non-operating Vibration (without non-recoverable errors)
              10Hz ................................. 0.015   G^2/Hz
              40Hz ................................. 0.015   G^2/Hz
             500Hz ................................. 0.00015 G^2/Hz
    
  • units
        You have: g
        You want: mm/sec^2
                * 9806.65
                / 0.00010197162
    http://www.bulkhandling.com.au/pdfs/7-Aspec-PDF.pdf 
        'Dwellings' 5 mm/s
    dc
        5 10197162 * p # 50985810
            -> 0.00051 x Gravity
    
    

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