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Cluster size selection in guiformat

- October 8, 2025 at 1:43 pm
  
  praveen.faster
  Subscriber
  
  Hi, which is the right cluster size for old HDD to use with guiformat for formatting drives with FAT32 format?
- October 17, 2025 at 1:45 pm
  
  MangeshANSYS
  Ansys Employee
  
  Hello, this question is abourt operating system and should ideally be asked on a Microsoft Forum
  Please refer to this information
  https://support.microsoft.com/en-us/topic/description-of-default-cluster-sizes-for-fat32-file-system-905ea1b1-5c4e-a03f-3863-e4846a878d31
- May 7, 2026 at 7:16 am
  
  cristinodevin
  Subscriber
  
  For older HDDs, 32KB cluster size usually provides a good balance of performance and storage efficiency in FAT32. I recently formatted a large external drive using GUI Format and found it much more convenient and reliable than the default Windows formatting tool.

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