# Drive Selection Reference

Based on your system screenshots, here's the correct drive mapping:

## Current System Layout (from screenshots):

### Available Drives:
- **`/dev/nvme0n1`** - 476.9G KXG6AZNV512G TOSHIBA
  - ✅ **INTERNAL DRIVE** (source)
  - This is your current system with:
    - nvme0n1p1: 58GB Linux filesystem (root)
    - nvme0n1p2: 512MB EFI system  
    - nvme0n1p3: 417GB Linux filesystem (home)

- **`/dev/sda`** - 476.9G Tech JMicron
  - ✅ **EXTERNAL M.2 SSD** (target)
  - This should be selected as migration TARGET
  - Will be completely wiped and converted to LVM

- **`/dev/sdb`** - 119.3G Extreme Pro SanDisk
  - 🔧 **USB STICK** (migration tools)
  - This USB stick with the migration tools
  - Should NOT be selected for migration

## Correct Migration Configuration:

```
Source (Internal): /dev/nvme0n1 → Target (External): /dev/sda
```

## What the Enhanced Script Now Does:

1. **Excludes USB stick** - Won't offer /dev/sdb as an option
2. **Shows drive details** - Displays size, model, USB detection
3. **Suggests configuration**:
   - Internal: /dev/nvme0n1 (NVMe drives are typically internal)
   - External: /dev/sda (USB-connected drives are typically external)
4. **User confirmation** - Asks you to confirm before proceeding
5. **Final safety check** - Shows exactly what will be wiped
6. **Type 'YES' confirmation** - Prevents accidental data loss

## Migration Process:

1. **Boot from USB** (/dev/sdb)
2. **Run migration script**
3. **Script will suggest**:
   - Internal: /dev/nvme0n1 (476.9G TOSHIBA)
   - External: /dev/sda (476.9G JMicron) 
4. **Confirm selection**
5. **Type 'YES' to proceed**

This should prevent the wrong drive selection issue you encountered!