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

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

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

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 parted /dev/sda print reports the following:

Error: Unable to open /dev/sda - unrecognised disk label.
Information: Don't forget to update /etc/fstab, if necessary.

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

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Does /dev/sda1 exist? Use gdisk to inspect GPT partitions, i.e. gdisk -l /dev/sda. –  mgorven Jun 11 '12 at 1:59
    
@mgorven good point about using gdisk instead of fdisk. As for /dev/sda1, it most probably exist or the error messages would be completely wrong. –  Huygens Jun 11 '12 at 8:04
    
If you don't get an answer here, your question can also be posted on Super User. They are more people there so more chance that someone knowledgable answer you. If you do so and get an answer there, please answer your own quesion by linking to the answer on Super User. –  Huygens Jun 12 '12 at 8:09
    
You might also want to check whether CONFIG_EFI_PARTITION is enabled in kernel configuration (it should be). –  peterph Jan 1 '13 at 22:14
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