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Actual space on a 3TB HD
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Mac Elite
Join Date: Sep 2000
Location: Boynton Beach, Florida, USA
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I just purchased a 3TB Seagate SATA HD and placed it in an OWC Mercury Elite case advertised as being capable with all drives up to 4TB in capacity. After formatting the drive, it shows up as 2.2TB in capacity, with 875.5MB being used. Is that normal? I have the Drive connected to a 17" early 2011 quad-core MBP via firewire 800.
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Last edited by davidflas; Feb 25, 2012 at 07:37 PM.
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2.7Ghz 15" Mid 2012 MBP 16GB RAM 7.2k 750GB HD anti-glare display|64GB iPad4 ATT LTE|
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Administrator  Join Date: Jun 2000
Location: California
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3 trillion decimal converts to 2.728 TB. On the other hand, are you seeing "2.199 TB"?
2 TB converted to decimal becomes 2,199,023,255,552 bytes. Which would indicate something is limiting it to 2 TB.
Suggestion: the drive may have come from the factory already partitioned. When you formatted, did you just erase the drive to HFS+, or did you hit the Partition tab and make one partition of the entire drive?
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Mac Elite
Join Date: Sep 2000
Location: Boynton Beach, Florida, USA
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This is what I see in disk utility:
Capacity : 2.2 TB (2,198,679,281,664 Bytes)
Available : 2.2 TB (2,197,803,872,256 Bytes)
Used : 875.4 MB (875,409,408 Bytes)
Format : Mac OS Extended (Journaled)
Owners Enabled :No
Number of Folders :14 Number of Files :54
When I got the drive, I placed it in a 2007 vintage OWC Mercury elite enclosure which previously held a 1TB Seagate drive. I simply erased it to HFS+ and it said that I had an 800GB drive. I contacted OWC and they said that my enclosure was incompatible with the new drive, so I bought a new OWC enclosure. Before formatting again, the drive appeared to be a 2.2TB drive with an 800GB partition. At no time did I attempt to make more than one partition. After formatting the same way I did when the drive was in its old enclosure, the above results occurred. I know that a 3TB drive is not going to have the full 3TB, but 2.2 seems a bit low. This is my first experience with a drive larger than 1TB, so I may have done something wrong. Reformatting using the erase tab makes no difference.
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2.7Ghz 15" Mid 2012 MBP 16GB RAM 7.2k 750GB HD anti-glare display|64GB iPad4 ATT LTE|
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Mac Elite
Join Date: Sep 2000
Location: Boynton Beach, Florida, USA
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Ok, I contacted OWC tech support and they directed me to flip a switch located inside the HD case, I now see the following info in Disk Utility:
Capacity : 3 TB (3,000,249,008,128 Bytes)
Available : 3 TB (2,999,241,785,344 Bytes)
Used:1.01 GB (1,007,222,784 Bytes)
Format :Mac OS Extended (Journaled)
Number of Folders : 11 Number of Files :52
Seems like they ought to mention that switch in the owner's manual. Anyway, problem solved. Thanks for getting me on the right track, Reader50!
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2.7Ghz 15" Mid 2012 MBP 16GB RAM 7.2k 750GB HD anti-glare display|64GB iPad4 ATT LTE|
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Posting Junkie
Join Date: Oct 2005
Location: Houston, TX
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Yea, the 2.2 TB (2TiB) limit was from half-assed ATA-6 (48-bit) LBA implementations only using 32 bits: 2^32 sectors * 512 bytes/sector = 2.2TB
It's analogous to the previous ATA-1 (28-bit) LBA limit we ran into at 137 GB (128 GiB).
Using a switch to control LBA behavior is something bizzare I haven't seen before.
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