Warning: /dev/sda contains GPT signatures, indicating that it has a GPT table.
However, it does not have a valid fake msdos partition table, as it should.
Perhaps it was corrupted -- possibly by a program that doesn't understand GPT
partition tables.  Or perhaps you deleted the GPT table, and are now using an
msdos partition table.  Is this a GPT partition table?
Yes/No? Yes
Error: The backup GPT table is corrupt, but the primary appears OK, so that will
be used.
OK/Cancel? Ok
Model: ATA Hitachi HTS54505 (scsi)
Disk /dev/sda: 500GB
Sector size (logical/physical): 512B/4096B
Partition Table: gpt

Number  Start  End  Size  File system  Name  Flags


Error: /dev/sdb: unrecognised disk label

Model: JetFlash TS2GJFV30 (scsi)
Disk /dev/sdc: 2051MB
Sector size (logical/physical): 512B/512B
Partition Table: msdos

Number  Start   End     Size    Type     File system  Flags
 1      1049kB  2051MB  2050MB  primary  fat32        boot, lba