From: invalid@invalid.invalid   
      
   "David W. Hodgins"  writes:   
   > Carlos E.R.  wrote:   
   >> On 2024-08-10 22:49, bad sector wrote:   
      
   >>> I ran mkfs.ext4 to format a new 4tb ssd to ext4 and got the alert   
   >>> about *-O 64bit* and complied with it. Never seen it before, was   
   >>> that a smart or useful move?   
   >>>   
   >>         64bit   
   >>                Enables  the file system to be larger   
   >> than 2^32 blocks. This feature is set automatically,   
   >> as needed, but it can be useful to specify this feature   
   >> explicitly if the file system might need  to  be  resized   
   >> larger than  2^32  blocks,  even if it was smaller than   
   >> that threshold when it was originally created.  Note   
   >> that some older kernels and older versions of e2fsprogs   
   >> will not support file systems with  this  ext4  feature   
   >> enabled.   
   >>   
   >> Doesn't explain the implications.   
      
   Linux kernels from before (as far as I can see) 2.6.19 won’t be able to   
   access the filesystem. Not likely to be a problem in practice unless you   
   have a very old install.   
      
   > Seems clear to me. Format an ext4 file system with an install that   
   > uses the 64 bit feature and it will not be readable or writeable using   
   > a linux install that doesn't use it.   
      
   ??? that is not what it says at all.   
      
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