[user@dom0 ~]$ qvm-block
BACKEND:DEVID   DESCRIPTION                                        USED BY
dom0:nvme0n1p2  SK hynix BC711 HFM512GD3JX013N ()                  
dom0:nvme0n1p3  SK hynix BC711 HFM512GD3JX013N ()                  
dom0:nvme0n1p4  SK hynix BC711 HFM512GD3JX013N (Windows_RE_Tools)  
[mum@dom0 ~]$ qvm-block a work dom0:nvme0n1p3 -o ro
Traceback (most recent call last):
  File "/usr/bin/qvm-block", line 5, in <module>
    sys.exit(main())
  File "/usr/lib/python3.8/site-packages/qubesadmin/tools/qvm_device.py", line 298, in main
    args.func(args)
  File "/usr/lib/python3.8/site-packages/qubesadmin/tools/qvm_device.py", line 134, in attach_device
    options = dict(opt.split('=', 1) for opt in args.option or [])
ValueError: dictionary update sequence element #0 has length 1; 2 is required
[user@dom0 ~]$