root@a.kubuntu:~$ sudo f3probe --destructive --time-ops /dev/sda
F3 probe 7.0
Copyright (C) 2010 Digirati Internet LTDA.
This is free software; see the source for copying conditions.

WARNING: Probing normally takes from a few seconds to 15 minutes, but
         it can take longer. Please be patient.

Bad news: The device `/dev/sda' is a counterfeit of type limbo

You can "fix" this device using the following command:
f3fix --last-sec=61054975 /dev/sda

Device geometry:
                 *Usable* size: 29.11 GB (61054976 blocks)
                Announced size: 1.91 TB (4096000000 blocks)
                        Module: 2.00 TB (2^41 Bytes)
        Approximate cache size: 511.00 MB (1046528 blocks), need-reset=no
           Physical block size: 512.00 Byte (2^9 Bytes)

Probe time: 35'48"
 Operation: total time / count = avg time
      Read: 53.96s / 2097716 = 25us
     Write: 34'48" / 9419950 = 221us
     Reset: 574.7ms / 2 = 287.3ms