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Allocation unit size and maximum file size

  • Hard Drives
  • File Size
  • NTFS
  • HD
  • Storage
Last response: in Storage
January 25, 2012 8:38:47 PM

I've been searching the net in vain. I need a table that shows the maximum size of a file that a HD can hold in NTFS when formatted in different allocation unit sizes. Hope that makes sense. Thanks

More about : allocation unit size maximum file size

a c 459 G Storage
January 25, 2012 11:33:11 PM

"With the NTFS file system, you can have a maximum of 2^32 clusters per file. This is an implementation limitation, not a file size restriction."

AIUI, this means that a typical NTFS installation that uses 4KB clusters will have a maximum file size of ...

2^32 x 4KB = 16TB
a c 490 G Storage
January 25, 2012 11:55:12 PM

AFAIK it does not depend on allocation unit size. As implemented, the maximum file size in NTFS is just under 16Tb -- 1 cluster under. Take a look HERE.