Released June 2012, Model A1278. Intel processor with Turbo Boost, Up to 512 MB DDR5 Video RAM

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Why my new HDD is not recognised?

My Macbook frozen suddenly and presented the ? folder on startup so I assumed that the HDD (a WD blue 500Gb) was busted. I plugged in the original Toshiba drive I keep for emergencies and surely enough the Mac booted up. I bought a 1TB hybrid Seagate as a replacement. Problem is that the Mac does not recognise it. I even formatted in using usb caddy via disk utility (Mac OSX Extended Journalled) and tried again to no avail. Worst even, I checked the WD drive using the usb caddy and the WD diagnostics tool (in a Windows PC). Aparently, the disk seems to be fine.

Which brings me to the milion dolalr question. If this is no HDD, it is SATA connector. And if it is SATA connector, how come one of the HDDs, the Toshiba one, boots normally? beats me.

Beantwoord! View the answer Dit probleem heb ik ook

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Yes! You need a new drive cable. Here's why your WD worked and your Seagate was having problems.

Lets take a look at the WD drives' spec sheet: WD5000BEVT. If you look at the line 'Data transfer rate (max)' its only a SATA II drive (3.0 Gb/s).

Now lets look at the Seagate drives' spec sheet: ST1000LM014 Seagate uses a different term 'Interface' Here we see SATA III (6.0 Gb/s), SATA II (3.0 Gb/s) & SATA I (1.5 Gb/s) are all listed.

Unlike your WD drive this drive has auto sense so it matches the SATA speed of the system, where as the WD is a FIX'ed SATA drive {SATA II only}.

Now lets look at your systems specs: MacBook Pro 13" (Mid-2012). If we jump down to the 'Standard Hard Drive section we can see the system offers a SATA III (6.0 Gb/s) interface.

The system is able to support the higher data rate but the cable can't so this explains why you are having problems with the Seagate and not the WD drive as the lower data rate is not stressing the cable.

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Wow this is a very comprehensive answer! I am 99% certain that you are right! I will post some feedback once new cable is fitted!


I can now confirm that the issue was indeed a faulty driver cable. After replacing it, all my hdds were recognised. Thank you very much for your help


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Have you considered the possibility of a bad hard drive cable? Sounds like a classic example to me.

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I did indeed. The problem however is that the HDD cable in question works with myToshiba HDD but not with the other two HDDs that have been tested and found to be healthy. Not sure what to make out of this. I also run a Apple Harware Test (the one that comes up when you press D on startup) and it too came out ok. I will probably end up buying a new cable anyway, I just find this whole situation quite baffling.


It all comes down the the SATA spec the given drive is and what your system can support! Can you give us the exact make and model of your different drives. Next how about making sure your systems firmware is upto date. Follow this Apple T/N: About EFI and SMC firmware updates for Intel-based Mac computers. This T/N is a bit dated so you may have something newer. Just make sure you're at these levels.


the Western Digital is a 500GB WD5000BEVT-00A0RT0

the Seagate is a 1 TB ST1000LM014

EFI and SMC are up to date, I compared my System's information harware status against the link you kindly provided.

I believe this is a case of dodgy HDD cable as I unclipped it from the logic board, brushed it and clipped it back and the WD was recognised again. I am runnign a back up now and once ti is done I will check to see if the Seagate works too. If yes, the first thing I am goign to do tomorrow morning will be to order a new cable!


I can now confirm that the issue was indeed a faulty driver cable. After replacing it, all my hdds were recognised. Thank you very much for your help


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icecore zal eeuwig dankbaar zijn.

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