Default cluster sizes for FAT, exFAT and NTFS

Source: https://support.microsoft.com/en-us/help/140365/default-cluster-size-for-ntfs-fat-and-exfat

Note that to use below tables to determine the blocksize, assume a 512 bytes sector size. So a 4KB cluster size translates to a blocksize of 8 (8 * 512 bytes) in JpegDigger.

NTFS

Volume size Windows 7, Windows Server 2008 R2, Windows Server 2008, Windows Vista, Windows Server 2003, Windows XP, Windows 2000
7 MB–512 MB 4 KB
512 MB–1 GB 4 KB
1 GB–2 GB 4 KB
2 GB–2 TB 4 KB
2 TB–16 TB 4 KB
16TB–32 TB 8 KB
32TB–64 TB 16 KB
64TB–128 TB 32 KB
128TB–256 TB 64 KB
> 256 TB Not Supported

FAT16

Volume size Windows 7, Windows Server 2008 R2, Windows Server 2008, Windows Vista, Windows Server 2003, Windows XP, Windows 2000
7 MB–8 MB Not supported
8 MB–32 MB 512 bytes
32 MB–64 MB 1 KB
64 MB–128 MB 2 KB
128 MB–256 MB 4 KB
256 MB–512 MB 8 KB
512 MB–1 GB 16 KB
1 GB–2 GB 32 KB
2 GB–4 GB 64 KB
4 GB–8 GB Not supported
8 GB–16 GB Not supported
> 16 GB Not supported

Note The asterisk (*) means that it is available only on media with a sector size greater than 512 bytes.

FAT32

Volume size Windows 7, Windows Server 2008 R2, Windows Server 2008, Windows Vista, Windows Server 2003, Windows XP, Windows 2000
7 MB–16MB Not supported
16 MB–32 MB Not supported
32 MB–64 MB 512 bytes
64 MB–128 MB 1 KB
128 MB–256 MB 2 KB
256 MB–8GB 4 KB
8GB–16GB 8 KB
16GB–32GB 16 KB
32GB–2TB Not supported
> 2TB Not supported

exFAT

Volume size Windows 7, Windows Server 2008 R2, Windows Server 2008, Windows Vista, Windows Server 2003, Windows XP
7 MB–256 MB 4 KB
256 MB–32 GB 32 KB
32 GB–256 TB 128 KB
> 256 TB Not supported