From: daniel47@eternal-september.org   
      
   On 17/03/2025 10:49 pm, bad sector wrote:   
   > On 3/11/25 06:52, Daniel70 wrote:   
   >> Some time ago, I backed up my Laptop's 500GB internal HD to an 2TB   
   >> external HD using (I forget) ... It might have been 'dd' but I doubt it.   
   >>   
   >> However, the 500GB Internals Image took up 500GB on the External (i.e.   
   >> a byte-by-byte image, even the empty bytes, apparently!).   
   >>   
   >> Now, when I look at that External HD using my Win 11 Desk-top, it   
   >> doesn't 'see' anything.   
   >>   
   >> Is this because Linux is at a 'Higher'/'deeper' level than Windows can   
   >> 'see'??   
   >   
   > I would call that a reasonable observation with reference to the users.   
   >   
   >> If I back-up this Win-11 Desktop to the same External HD, is there a   
   >> possibility that Win-11 will write itself over the Linux Image?? Or is   
   >> Win-11 able to detect that there is 'something' there so will go   
   >> looking for the next available UNUSED portion of the External HD??   
   >   
   > dd if=/dev/sdA of=/somepath/mybackup-2025-03-17.dd bs=16M status=progress   
   >   
   > you can also create a partition exactly the same size as the source and   
   > then do   
   >   
   > dd if=/dev/sdS of=/dev/sdT bs=16M status=progress   
   >   
   > I got "bs=16M" from Carlos some time ago, speeds it up a bit.   
   >   
   > If you dd'd a partition you can even boot it and use it but remove the   
   > source drive before you do because both will have the same UUID. You can   
   > also ure a SuperGrub DVD to boot it if you find it difficult. But you   
   > can also mount a backup 'file' and look inside it   
   >   
   > mount -o loop /somepath/mybackup-2025-03-17.dd /someotherpath   
   >   
   > If you ever boot such a copy you need to be careful with UUID's but also   
   > with /etc/fstab content since other automounted partitions WILL fail to   
   > mount unless the edits are first maid.   
   >   
   > It really pays to use removable drive backplane racks, they give you   
   > tons of actual physical control that's increasingly being denied users.   
   > I just got me an icy-dock model that squeezes 6 ssd's + a dvd into a   
   > single 5-1/2 inch external bay and I haven't used ANY fixed internal   
   > drives for 3 decades.   
   >   
   I have no intention of ever booting from the Back-up, just wanting to   
   save my data .... but thanks for the suggestions. ;-)   
   --   
   Daniel70   
      
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