From Array Suite Wiki
Default value = OmicsoftDirectory\Temp
The temporary directory for Array Server.
Array Server may use up to 2-3 x the size of an uncompressed .fastq file in this folder for some complicated NGS tasks.
It is recommended that this directory be contained on a local drive (i.e. NOT a network drive) for fast read and write access. We would suggest use a drive with at least 100GB storage.