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Disk formats supported by Data ONTAP

The disk format determines how much of the disk’s raw capacity can be used for data storage. Some disk formats cannot be combined in the same aggregate.

Most disks used in storage systems are block checksum disks (BCS disks).

The amount of space available for data depends on the bytes per sector (bps) of the disk:
The disk formats by Data ONTAP disk type are as follows:

If you have an older storage system, it might have zoned checksum disks (ZCS disks). In ZCS disks, for every 64 (4,096 byte) blocks, one block is used for the checksum, and 63 blocks are available for data. There are rules about combining BCS disks and ZCS disks in the same aggregate.

Related concepts
Checksum rules for adding storage to an aggregate