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   PID: SoupGate-Win32 v1.05   
   On 03/08/2024 12:52, Björn Lundin wrote:   
   > On 2024-08-03 12:07, The Natural Philosopher wrote:   
   >   
   >> I am on the edge of my comfort patch here.   
   >> If I were building an SSD I would have a diode and a large capacitor   
   >> inside it to make sure all its caches were dumped to NVRAM before the   
   >> voltage collapsed completely.   
   >>   
   >> But on a big unit this could take a bit of time.   
   >>   
   >> What happens between a SATA/USB plug and the actual NVRAM is a bit of   
   >> a mystery.   
   >>   
   >> We know its nothing like a 1:1 correlation between 'sector' and   
   >> physical RAM location.   
   >> We knows that physical RAM locations are regularly shuffled for 'wear   
   >> levelling'   
   >> When is all this done?   
   >> What happens if, during it, there is power failure?   
   >>   
   >> I honestly do not know, hence the warning to leave the SSD for a few   
   >> seconds before yanking any power cords   
   >>   
   >> It can do no harm   
   >   
   > And that is my point. sync will do no harm either,   
   > but it might save you, especially when you are dd()ing an image smaller   
   > that the RAM of the computer.   
   > Like I have 32 Gb RAM, and dd an image of 4 Gb (like a headless) onto a   
   > SD-card to run an old pi. The interface is slow, yet dd reports done   
   > within a minute. sync takes a long time to flush it over.   
   >   
   > Just waiting a few secs will end in disappointment   
   >   
   Well I will be at some stage dd-ing about 60GByte across to a 2TB disk,   
   but given the hassle, sync and a cup of coffee wait before unplugging   
   it, is likely.   
      
   RK claims the wait afterwards isn't necessary.  Completing 'sync' is   
   enough. He generally doesn't comment unless he knows.   
      
   I simply do not know how a command to something purporting to resemble a   
   hard drive, that isnt can guarantee all data in it is flushed.   
      
      
   --   
   To ban Christmas, simply give turkeys the vote.   
      
   --- SoupGate-Win32 v1.05   
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