Update blk_size from 1K to 4K to align with the physical sector size of HDDs

[Besroy]

This change also supports larger blob sizes due to the limitation of max_blks_per_blkid

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.27%. Comparing base (1746bcc) to head (19d4c59).
Report is 71 commits behind head on main.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #297      +/-   ##
==========================================
- Coverage   63.15%   59.27%   -3.89%     
==========================================
  Files          32       33       +1     
  Lines        1900     3045    +1145     
  Branches      204      360     +156     
==========================================
+ Hits         1200     1805     +605     
- Misses        600     1047     +447     
- Partials      100      193      +93     

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