If no cluster size is specified during format, defaults are selected based on the size of the partition. These defaults have been selected to reduce the amount of space lost and to reduce the amount of fragmentation on the partition.
Default cluster sizes for NTFS
The following table describes the default cluster sizes for NTFS.
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| Volume size | Windows NT 3.51 | Windows NT 4.0 | Windows 2000, Windows XP, Windows Server 2003, Windows Vista, and Windows Server 2008 |
|---|---|---|---|
| 7 MB–512 MB | 512 bytes | 4 KB | 4 KB |
| 512 MB–1 GB | 1 KB | 4 KB | 4 KB |
| 1 GB–2 GB | 2 KB | 4 KB | 4 KB |
| 2 GB–2 TB | 4 KB | 4 KB | 4 KB |
| 2 TB–16 TB | Not Supported* | Not Supported* | 4 KB |
| 16TB–32 TB | Not Supported* | Not Supported* | 8 KB |
| 32TB–64 TB | Not Supported* | Not Supported* | 16 KB |
| 64TB–128 TB | Not Supported* | Not Supported* | 32 KB |
| 128TB–256 TB | Not Supported* | Not Supported* | 64 KB |
| > 256 TB | Not Supported | Not Supported | Not Supported |
Note
* means not supported due to the limitations of the MBR.
The following table describes the default cluster sizes for FAT16.
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| Volume size | Windows NT 3.51 | Windows NT 4.0 | Windows 2000, Windows XP, Windows Server 2003, Windows Vista, and Windows Server 2008 |
|---|---|---|---|
| 7 MB–8 MB | Not supported | Not supported | Not supported |
| 8 MB–32 MB | 512 bytes | 512 bytes | 512 bytes |
| 32 MB–64 MB | 1 KB | 1 KB | 1 KB |
| 64 MB–128 MB | 2 KB | 2 KB | 2 KB |
| 128 MB–256 MB | 4 KB | 4 KB | 4 KB |
| 256 MB–512 MB | 8 KB | 8 KB | 8 KB |
| 512 MB–1 GB | 16 KB | 16 KB | 16 KB |
| 1 GB–2 GB | 32 KB | 32 KB | 32 KB |
| 2 GB–4 GB | 64 KB | 64 KB | 64 KB |
| 4 GB–8 GB | Not supported | 128 KB* | Not supported |
| 8 GB–16 GB | Not supported | 256 KB* | Not supported |
| > 16 GB | Not supported | Not supported | Not supported |
* means only available on media with a sector size greater than 512 bytes.
The following table describes the default cluster sizes for FAT32.
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| Volume size | Windows NT 3.51 | Windows NT 4.0 | Windows 2000, Windows XP, Windows Server 2003, Windows Vista, and Windows Server 2008 |
|---|---|---|---|
| 7 MB–16MB | Not supported | Not supported | Not supported |
| 16 MB–32 MB | 512 bytes | 512 bytes | Not supported |
| 32 MB–64 MB | 512 bytes | 512 bytes | 512 bytes |
| 64 MB–128 MB | 1 KB | 1 KB | 1 KB |
| 128 MB–256 MB | 2 KB | 2 KB | 2 KB |
| 256 MB–8GB | 4 KB | 4 KB | 4 KB |
| 8GB–16GB | 8 KB | 8 KB | 8 KB |
| 16GB–32GB | 16 KB | 16 KB | 16 KB |
| 32GB–2TB | 32 KB | Not supported | Not supported |
| > 2TB | Not supported | Not supported | Not supported |
The following table describes the default cluster sizes for exFAT.
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| Volume size | Windows XP, Windows Server 2003, Windows Vista and Windows Server 2008 |
|---|---|
| 7 MB–256 MB | 4 KB |
| 256 MB–32 GB | 32 KB |
| 32 GB–256 TB | 128 KB |
| > 256 TB | Not supported |
APPLIES TO
Microsoft Windows 2000 Server
Microsoft Windows 2000 Advanced Server
Microsoft Windows 2000 Professional Edition
Microsoft Windows 2000 Datacenter Server
Microsoft Windows NT Workstation 3.5
Microsoft Windows NT Workstation 3.51
Microsoft Windows NT Workstation 4.0 Developer Edition
Microsoft Windows NT Server 3.5
Microsoft Windows NT Server 3.51
Microsoft Windows NT Server 4.0 Standard Edition
Microsoft Windows Server 2003, Datacenter Edition (32-bit x86)
Microsoft Windows Server 2003, Enterprise Edition (32-bit x86)
Microsoft Windows Server 2003, Standard Edition (32-bit x86)
Microsoft Windows Server 2003, Web Edition
Windows Server 2008 Datacenter without Hyper-V
Windows Server 2008 Enterprise without Hyper-V
Windows Server 2008 for Itanium-Based Systems
Windows Server 2008 Standard without Hyper-V
Windows Server 2008 Datacenter
Windows Server 2008 Enterprise
Windows Server 2008 Standard
Windows Vista Enterprise 64-bit Edition
Windows Vista Home Basic 64-bit Edition
Windows Vista Home Premium 64-bit Edition
Windows Vista Ultimate 64-bit Edition
Windows Vista Business 64-bit Edition
Windows Vista Enterprise
Windows Vista Home Basic
Windows Vista Home Basic Beta
Windows Vista Home Premium
Windows Vista Starter
Windows Vista Ultimate
Ref link: http://support.microsoft.com/kb/140365
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