Here's a concise guide on how to format a drive as ext4 and mount it using UUID on a Debian system:

### 1. Identify the Drive
First, identify the drive you want to format. You can use the `lsblk` command:
```bash
lsblk
```

### 2. Format the Drive as ext4
Assuming your drive is `/dev/sdX` (replace `X` with the appropriate letter), format it as ext4:
```bash
sudo mkfs.ext4 /dev/sdX
```

### 3. Get the UUID of the Drive
Retrieve the UUID of the newly formatted drive:
```bash
sudo blkid /dev/sdX
```
Note the UUID, which will look something like `UUID="xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"`.

### 4. Create a Mount Point
Create a directory where you want to mount the drive. For example:
```bash
sudo mkdir /mnt/mydrive
```

### 5. Edit the fstab File
Open the `/etc/fstab` file in a text editor:
```bash
sudo nano /etc/fstab
```

Add the following line at the end of the file, replacing `xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx` with the actual UUID and `/mnt/mydrive` with your desired mount point:
```bash
UUID=xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx /mnt/mydrive ext4 defaults 0 2
```

### 6. Mount the Drive
Mount all filesystems mentioned in `/etc/fstab` to apply the new configuration:
```bash
sudo mount -a
```

### 7. Verify the Mount
Check that the drive is mounted correctly:
```bash
df -h
```

You should see the drive listed with the mount point you specified.

That's it! You've successfully formatted the drive as ext4 and mounted it using its UUID.