Windows 7 Partitioning

Having trouble getting a windows partitions bigger than 2 Terabytes?  It all comes down to cluster size.  For some reason my windows 7 is using 512 Byte cluster sizes.  When formatting a drive you can change the cluster size to be much larger than 512 Bytes.  They can be set up to 65,536 Bytes.

Cluster size Maximum NTFS Volume Size (bytes RAW)
512 2,199,023,255,040 (2TB)
1,024 4,398,046,510,080 (4TB)
2,048 8,796,093,020,160 (8TB)
4,096 17,592,186,040,320 (16TB)
8,192 35,184,372,080,640 (32TB)
16,384 70,368,744,161,280 (64TB)
32,768 140,737,488,322,560 (128TB)
65,536 281,474,976,645,120 (256TB)


To format a volume with an 8192 Byte cluster, use the following command:

format d: /fs:ntfs /a:8192

Replace 8192 with the cluster size you wish to use.

These commands must be ran as Administrator.

To check the cluster size of your current drive volumes, use:

fsutil fsinfo ntfsinfo c:

Replace c: with the volume you wish to check.












Run as Administrator

To run software with Admin privileges, simply hold ctrl+shift when you launch the application.  If you have UAC enabled, it will prompt you at this point before opening the software.

If you wish to use the mouse, simply locate the software in your start menu. Simply right click on the software and choose Run as Administrator.