An allocation unit may refer to any of the following:

  1. An allocation unit is a group of reserved sectors on a computer hard drive.

  2. With memory, an allocation is a process performed by the computer that assigns a block of memory for a program to store its data.

  • I’m getting bad sectors, clusters, or missing allocations.
  • Hard drive help and support.

Block, Deallocation, Hard drive terms, Memory terms

  • Memory (RAM) help and support.