Canvio Connect II を FreeBSD 10.2 RELEASE に繋いだときの dmesg。

da1 at umass-sim1 bus 1 scbus4 target 0 lun 0
da1: <TOSHIBA External USB 3.0 5438> Fixed Direct Access SPC-4 SCSI device
da1: Serial Number 20151020007091F
da1: 40.000MB/s transfers
da1: 2861588MB (5860533164 512 byte sectors: 255H 63S/T 364801C)
da1: quirks=0x2<NO_6_BYTE>

次に、fdisk。

# fdisk /dev/da1
******* Working on device /dev/da1 *******
parameters extracted from in-core disklabel are:
cylinders=364801 heads=255 sectors/track=63 (16065 blks/cyl)

Figures below won't work with BIOS for partitions not in cyl 1
parameters to be used for BIOS calculations are:
cylinders=364801 heads=255 sectors/track=63 (16065 blks/cyl)

Media sector size is 512
Warning: BIOS sector numbering starts with sector 1
Information from DOS bootblock is:
The data for partition 1 is:
sysid 238 (0xee),(EFI GPT)
    start 1, size 4294967295 (2097151 Meg), flag 0
        beg: cyl 0/ head 0/ sector 2;
        end: cyl 1023/ head 255/ sector 63
The data for partition 2 is:

The data for partition 3 is:

The data for partition 4 is:

GPT で初期設定されている。gpart を使って表示。

# gpart show da1
=>        34  5860533097  da1  GPT  (2.7T)
          34      262144    1  ms-reserved  (128M)
      262178        2014       - free -  (1.0M)
      264192  5860268032    2  ms-basic-data  (2.7T)
  5860532224         907       - free -  (454K)