From: nospam@needed.invalid   
      
   On Sun, 7/27/2025 5:59 AM, Felix wrote:   
   > Lawrence D'Oliveiro wrote:   
   >> On Fri, 25 Jul 2025 14:47:51 +1000, Felix wrote:   
   >>   
   >>> How does LM treat HD bad sectors?   
   >> You have to specify a list of them to be excluded from file allocations   
   >> when you initialize a filesystem on the disk. Note the -c option in mke2fs   
   >> , which tells it to do a scan to   
   >> find these for itself.   
   >   
   > so this is the correct command to create ext4 file system with normal   
   cluster size and read/write test?..   
   >   
   > *mkfs.ext4 -c -c*   
   >   
   >>   Or the -l option to get a list of them from a   
   >> separate file.   
   >>   
   >> Frankly, I wouldn’t like to touch a disk with bad blocks on it. Once they   
   >> start happening, they’re only likely to get worse.   
   >   
   > I want to know if disks are good to use them or not   
   >   
      
   You do a surface scan.   
      
   Some tools provide a graphical output as a "map" to give you some   
   idea whether there is any pattern to the CRC errors.   
      
      http://www.hdtune.com/errorscan_failed.png   
      
   It can take hours, to finish one of those surface scans.   
      
     Paul   
      
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