Why is the default allocation unit size smaller (2048 bytes) for exFAT than for NTFS (4096 bytes) when formatting a disk on Windows 7?

Asked Jan 29 '22 at 06:44

Active Jan 29 '22 at 07:11

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I see that the default allocation unit size is smaller for exFAT (2048 bytes) than for NTFS (4096 bytes) when formatting a disk on Windows 7 via Windows Explorer:

Why is the default allocation unit size smaller (2048 bytes) for exFAT than for NTFS (4096 bytes)?

edited Jan 29 '22 at 07:11

asked Jan 29 '22 at 06:44

Franck Dernoncourt

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According to the Microsoft documentation for the exFAT it should be 128KB for volume size 32 GB–256 TB capacity, on the Windows 7: Default cluster size for NTFS, FAT, and exFAT – Jackdaw Jan 29 '22 at 07:02
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"Why is the default allocation unit size smaller (2048 bytes) for exFAT than for NTFS (4096 bytes)?" -- You're not reading the screen correctly. I see an allocation size of 2MB (actually "2048 kilobytes") in the exFAT window on the right side. So 2MB for exFAT is not smaller than 4KB for NTFS. – sawdust Jan 29 '22 at 07:18
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@FranckDernoncourt: Check answers for this post: Why is exFAT's default allocation size in Windows so high?. – Jackdaw Jan 29 '22 at 07:18

Why is the default allocation unit size smaller (2048 bytes) for exFAT than for NTFS (4096 bytes) when formatting a disk on Windows 7?

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