I have a MacBook Pro (Mid 2010, Snow Leopard 10.6.8) and I bought a Freecom external HD Quattro 3.0, 3TB model, which have USB2.0/3.0, FW400/800 and eSATA connections. The enclosed HD is an Hitachi Deskstar 5K3000.
If I connect the HD through USB2.0 the OS recognizes it as a 3TB HD. I can format it, create partitions, etc... with no problem.
But if I connect the HD through the FW800 the OS recognizes it as a 2.2TB HD! No matter of GUID partition table and the like.
I tried also to create 2 partition 1.5TB each using USB2.0 and then connect through FW800 but all I can see is just the first partition. And still the OS (and DiskUtil) recognizes it as a 2,2TB HD.
I booted Linux Ubuntu 11.10 64-bit (through the Live CD) and I connected the HD through FW800. Linux recognizes the HD as a 3TB HD! I can format it, create partitions, etc.. using GParted with no problem.
Partitions created with Linux are recognized (the whole 3TB) by Mac OS if I use USB2.0, but using FW800 the HD is always recognized as a 2.2TB capacity disk.
I think this means that there are no hardware limitation, neither in the MacBook Pro nor in the external HD.
It seems it's a problem in the FW800 software/drivers in Mac OS.
Hope this help.
For those of you using OWC external enclosures, I found that there was a dip switch toggle in my OWC enclosure which allows Large Block Addressing. Mine was off by default (i.e. limits to 2.2 TB). Switching the dip switch to "1" solved my issue and now able to access the full 3TB using firewire connected to iMac.
Mercury Elite Pro. Red dip switch on the inside of the box on the board. Realized this by reading the online OWC owners manual. You may want to consult the ministack manual or assembly manual.
This works! I just received my Mercury Elite Pro, with a Seagate Barracuda 3TB drive. When I first used it, it only showed up as 2.2 TB. I opened the enclosure and saw a red dip-switch that was in the '0' (zero) position. I switched it to '1' and it works now!
I just had to open Disk Utility after this change was made and remove and readd the partition. 3.0TB :-)
How has everyone's experience been putting the computers to sleep?
I'm using a Rosewill RX-358 V2 with a Samsung 2TB HD204UI "green" drive over USB2. When I put the Late 2011 MacBook Pro to sleep, the drive initially goes to sleep but then wakes back up moments later. And then never returns to sleep.
I swapped in an older WD 320GB (WD3200JS) drive and it does the exact same thing. The WD drive, as far as I know, is not a green drive. So this leads me to believe the controller in the Rosewill enclosure doesn't play nice with Lion 10.7.2.
Just an update/aside:
I was correct in assuming my problems were in relation to the controlelr in the RX-358 v2. In my opinion, this enclosure is not Lion-friendly (see my post above re: the issues I was having).
I purchased an OWC Mercury Elite Pro:
When I put the MAcbook to sleep, the drive goes to sleep.
When I shutdown the Macbook, the drive will initially go to seleep but then wakes back up and stays up. I suspect this has to do with the Macbook sending power over USB. Or perhaps the "Eco" controller in my Samsung HD?
I haven't tried it with Firewire yet.
Same problem here:
3GB Seagate Barracuda in Nexstar 3 enclosure w/ eSata and USB
Via USB on MacBook Pro (below) does not mount and shows as ~800Gb in Disk Utilities
on MacPro Desktop running 10.6.8 it works fine.
OS X Lion 10.7.3 (11D50)
2.33 GHz Core 2 Duo
Host Controller Location: Built-in USB
Host Controller Driver: AppleUSBUHCI
PCI Device ID: 0x27c8
PCI Revision ID: 0x0002
PCI Vendor ID: 0x8086
Bus Number: 0x1d
You say it works fine on the MacPro: through which interface, USB or eSAta?
In every case I have seen, it is the enclosure's firmware on its bridge board which is at fault.
When you use eSATA with an eSATA card, there is no need for a bridge.
When you use USB or FireWire, the bridge board translates between the drive SATA interface and the USB or FireWire protocol. The posts above which indicate it working on USB and not on FireWire reflects the fact that USB and FireWire use two different chipsets on the bridge board, so it isn't unusual that the performance can differ.
I can add a few more sad facts to the post.
I've tried this with two different brands of 3TB drives (WD Green, and Seagate Barracuda); two different LaCie FW-800 and a NexStar USB-2 enclosure; I've tried all of these combinations on OSX 10.8.2 and one of the drives and the USB-2 interface on OSX 10.6.8. In all cases the drives show up as 802 GB in size in Disk Utility. I have yet to find a combination of actions, settings, or partitions that make the total usable space anything larger than 802 GB.
So it's probably not an issue with a cheep enclosure, a particular brand of disk, disk failures, or the latest OS.