# Replacing a Drive Prior to Failure

If you want to replace a drive prior to failure, follow this guide. To replace a drive post failure see here [Replacing Failed Disks](https://docs.coltscomputer.services/books/truenas/page/replacing-failed-disks "Replacing Failed Disks")

This guide is for TrueNAS Cobia

- Attach the new drive to the system
- Navigate to Storage > Pool > Manage Devices > Click on the VDEV containing the disk you want to replace > Select the disk > Select the Replace option > Select the new disk
- Wait for the resilver process to complete
- Run a full scrub of the pool
- Shut down the system
- Remove the old disk
- Start the system again