# Replacing physical drives in an array

If you have an array built with one or more physical drives that are not the same size, or you simply want to upgrade the array with new, larger drives, you can replace the physical drives in the array.

Attention: During the rebuild operation, if another physical drive fails, there is the risk of losing data.

1. Replace the physical drive in the server or enclosure with a larger physical drive.
2. Wait for the rebuild to complete.
3. Repeat steps 1 and 2 until you have replaced all the smaller physical drives in the array.

## More information

- Example: Usable and unusable capacity

Glossary | Contents

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