# Selecting the logical drive size

When you select the logical drive size, consider the following:

- If you change the RAID level of a logical drive, the total size (data plus parity) of the logical drive might change.

- If you do not use all available free space, you can create another logical drive. Click Create new logical drive to do so. You can assign the same or a different RAID level to additional logical drives.

- You cannot delete the last remaining logical drive in the array. You must have at least one logical drive for each array.

- Refer to the documentation provided with your operating system for information about the recommended logical-drive size.

- The default RAID configuration uses all available free space.

## More information

- Understanding creating logical drives
- Selecting the RAID level by array capacity
- Creating logical drives (action)
- Configuring RAID and creating arrays (action)
- Creating logical drives in the wizard
- Example: Usable and unusable capacity

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