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Why is there a 750GB limitation with an optical drive bay HDD?

I would like to install a 1TB 2.5 HDD in the optical bay slot (Macbook Pro Unibody mid 2012).

I currently have a 500GB HDD in the optical bay and a 500GB SSD in the original hard drive bay.

I am curious to the 750 GB limitation that is noted in the description.

Product Code: IF107-080-3

Update

The specs:

2012 macbook pro

10.10.3 OS X

4 GB Ram

2.53Ghz Quad I7

500 SSD has 1 OS partition

500 HDD 5400 RPM has 1 data partition

1 TB HDD 7200RPM has multiple partitions

Initial config:

500 SSD in HDD bay

500 HDD (original drive) in Optical bay

Benchmark SSD:Write 1024KB (451.306 MB/sec) Max

Results:

500 SSD boots properly

500 HDD reads and writes properly

New Configuration 1:

500 SSD in Optical Bay

1TB HDD in HDD bay

Results:

the 1 TB drive worked fine.

The 500 SDD (with the primary OS partition) had difficulty booting. After several attempts, the SDD booted to the OS. I attempted to run a benchmark test. The results were sporadic and had several force restarts.

Benchmark SSD:Not stable enough to officially record

New Configuration 2:

500 SSD in HDD bay

1 TB HDD in Optical bay

Results:

The SSD worked fine.

After booting to OS (using SSD), the 1 TB drive requested that I Initialize the drive. (Disk utility shows the individual partitions (disk1s1 etc) without any names) Occasionally, a single partition will mount and it is not always the same partition that mounts from that drive.

If a 1TB drive works, maybe it needs to be <7200 Rpm?

Answered! View the answer I have this problem too

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If you have a question about a particular product, please give a link to it so I don't have to spend ten minutes hunting it down. This forum is manned by volunteers, not by iFixit employees.

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You could install your 500GB SSD in the optical bay and the 1TB HDD in the original HDD bay..

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That is very curious. Other opt-bat devices do not seem to have this limitation: http://www.mcetech.com/optibay/

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This "optibay" from mcetech seemed to make the difference. The benchmark difference was only 2 -10 mb/s instead of hundreds when installed with the ssd. I haven't tried the 1tb, but I'm confident it would work with this optibay. Thank you for the alternative option!

I'm not sure why, but the ifixit model does have a hardware limitation. Though, I'm not sure why that is, I will confirm that it does.

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I think the issue is drive height. Back in the day 1TB drives were higher so they couldn't fit the limit of 9.5mm of the carrier. So, if you have a drive that is 9.5mm or smaller and doesn't pull too much power it will work. Remember the SATA interface does not have any limits from a drive size. The systems BIOS & OS likewise have no bearing as well. I still recommend using the newest the system can support.

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