DRDOS 5.00 FDISK CLUSTER SIZE
                                  Bradley Kerth
                                     7/23/90


             The  cluster size the FDISK will select depends on the  size
        of the partition being created. The cluster size for a particular
        partition size is shown in the following table:


        Partition Size    Bytes/Sector    Sectors/Cluster   Cluster Size

        0 - 127.9MB          512                4               2K

        128 - 255.9MB        512                8               4K

        256 - 512MB          512               16               8K

             The cluster size is adjusted for different partitions 
	because of the use of a 16 bit File Allocation Table (FAT).
	DR/PC/MS DOS use a 16 bit FAT and can therefore keep track of 
	65,536 clusters. If each of these clusters is 2k, 2k x 65,536 is
	about 127.9MB. If a larger partition is desired, the cluster size
	has to be increased since the number of clusters is limited. Thus
	the cluster size goes to 4k. 4k x 65,536 is about 255.9MB. At that
	point, the cluster size has to be adjusted again.

	If a third party utility is used to create a partition using 
	different cluster sizes, the bytes per sector setting must be a
	power of 2 (..,64,128,256,512,1024,..).

	The above information is based upon using the FDISk utility
	included in the February Business Update or in releases
	manufactured after that time. 

	The following is for releases of DRDOS prior to 2/1/91

	PARTITON SIZE	  BYTES/SECTOR	 SECTORS/CLUSTER    CLUSTER SIZE

	0 - 63.9MB	     512	     4			2K

	64 - 127.9MB	     512	     8			4K

	128 - 512MB	     512	     16			8K