Update 'docs/proxmox/vm-passthrough-harddrives'

docs/proxmox/vm-passthrough-harddrives

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+```
+# Passthrough Harddisks to Proxmox VM's  
+
+1. In Proxmox terminal install `lshw`:
+apt-get update && apt-get install -y lshw
+
+2. Look and copy harddisk `product`:
+lshw -class disk -class storage
+
+3. Get the full id with, replace `{{product id you copied}}` with the product id you copied from last command:
+ls -l /dev/disk/by-id/ | grep {{product id you copied}}
+
+4. Add it to your VM:
+qm set {{VM ID}} -scsi2 /dev/disk/by-id/{{Full ID copied from last command}}
+
+`-scsi2` this is assuming VM only has 1 Harddisks
+If you are adding multiple Harddisks `-scsi2` should always increase +1.
+
+EG:
+First Disk:
+qm set {{VM ID}} -scsi2 /dev/disk/by-id/{{Full ID copied from last command}}
+
+Second Disk:
+qm set {{VM ID}} -scsi3 /dev/disk/by-id/{{Full ID copied from last command}}
+
+Third Disk:
+qm set {{VM ID}} -scsi4 /dev/disk/by-id/{{Full ID copied from last command}}
+```