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projects/community-forum/forum-posts/arch-linux-ext4-home-from-windows-drive.md
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# Guide: Repurpose Old Windows BitLocker Drive as /home on Arch Linux
## Environment
- OS: CachyOS (Arch-based) with btrfs root
- Existing /home: btrfs subvolume (@home) on OS drive
- Secondary drive: 954GB NVMe with Windows BitLocker partition
## Goal
Wipe the old Windows drive and mount it as `/home` on ext4, giving a dedicated large partition for user data separate from the OS.
## Steps
### Step 1: Identify the Drive
```bash
lsblk -o NAME,SIZE,TYPE,FSTYPE,MOUNTPOINT,MODEL
```
Output:
```
nvme0n1 953.9G disk SKHynix_HFS001TEJ9X115N
├─nvme0n1p1 4G part vfat /boot
└─nvme0n1p2 949.9G part btrfs /root <-- OS drive
nvme1n1 953.9G disk SKHynix_HFS001TEJ9X115N
├─nvme1n1p1 16M part <-- Windows MSR
└─nvme1n1p2 953.9G part BitLocker <-- Target drive
```
### Step 2: Wipe and Partition
```bash
# Wipe all filesystem signatures
sudo wipefs -a /dev/nvme1n1
# Create GPT table with single ext4 partition
sudo parted /dev/nvme1n1 --script mklabel gpt mkpart primary ext4 0% 100%
# Format with label
sudo mkfs.ext4 -L home /dev/nvme1n1p1
```
### Step 3: Copy Existing /home
```bash
# Mount new partition temporarily
sudo mount /dev/nvme1n1p1 /mnt
# Copy everything preserving permissions, ACLs, and extended attributes
sudo rsync -aAXv /home/ /mnt/
# Verify
ls -la /mnt/yourusername/
du -sh /mnt/yourusername/
# Unmount
sudo umount /mnt
```
### Step 4: Get UUID
```bash
sudo blkid /dev/nvme1n1p1
# UUID="4143f922-455f-4154-8f87-6df123548916" TYPE="ext4"
```
### Step 5: Update /etc/fstab
Replace the existing `/home` mount entry. If coming from a btrfs subvolume setup:
```bash
# BEFORE (btrfs subvolume):
# UUID=8a8b1d34-... /home btrfs subvol=/@home,defaults,noatime,compress=zstd:1 0 0
# AFTER (ext4 on new drive):
UUID=4143f922-455f-4154-8f87-6df123548916 /home ext4 defaults,noatime 0 2
```
### Step 6: Reboot
```bash
sudo reboot
```
### Step 7: Verify After Reboot
```bash
df -h /home
# Should show /dev/nvme1n1p1 mounted at /home with ~938GB available
mount | grep home
# /dev/nvme1n1p1 on /home type ext4 (rw,noatime)
```
## Notes
- The old btrfs `@home` subvolume remains on the OS drive as an automatic backup. You can delete it later with `sudo btrfs subvolume delete /path/to/@home` if you need the space.
- ext4 was chosen over btrfs for the /home drive for simplicity and maximum compatibility. If you prefer btrfs features (snapshots, compression), use `mkfs.btrfs` instead.
- The `noatime` mount option reduces unnecessary writes by not updating file access timestamps.
- Pass `0 2` in fstab (not `0 0`) so fsck runs on boot if needed, but after the root filesystem (which is `0 1`).