I have a 3TB USB 2.0 hard-drive which has two HFS+ (Mac) partitions using GUID partition table for the partition records. How can I mount these partitions on a Debian system, specifically a Netgear ReadyNAS?

Running fdisk -l raises the following issue:

WARNING: GPT (GUID Partition Table) detected on '/dev/sda'! The util fdisk doesn't support GPT. Use GNU Parted.

Running mount -t hfsplus /dev/sda1 /mnt/usbtemp/ reports the following:

mount: /dev/sda1 is not a valid block device

Is it possible to mount these partitions on my Debian system?