If I'm understanding you correctly, you're trying to replace your internal HDD. The late 2006 macbook default drive is a 4200 or 5400 rpm SATA drive, you'd have to replace it with the same connection type. If you're replacing a previous SATA drive, you'll want a new SATA drive.
USB 3 won't connect in a SATA slot. You could, however, use an external dock for the USB 3 drive, but the Macbook won't receive USB 3 speeds, so I once again urge you to go SATA as it will be faster.
USB3 is only the external connection. The drive is a SATA drive.
If you look to the right of 2nd image that rectangular recess contains the set of 4 power pins.
They do not line up on my (new) Seagate HDD (much like the above image which is a HP) when I compare them with what was in the Macbook which has them almost hard up to the right of the device.
I have hunted all over the net and nowhere does anyone mention these drives have different positions for the connections.
The question is, were the Macbook's HDDs unique or a dated standard no longer available?
I know you mean well, but…
Drives are not USB, connections are.
This is obviously a 2.5" SATA drive not an IDE. I have merely extracted it from its case. Internal is just its location inside the case, or inside the Macbook.
And whether the power connection is "standard" is the issue I raised, hardly helpful to tell me I won't be able to connect if it isn't.
Peter, this is strange, connections should be identical. I bet you do not confuse ATA with S-ATA, as the form and dimensions are completely different.
In my experience with upgrading several such hard disks of several generations of MBs, the problem consists in a rubber protection strip which is along the hard drive, this may obstruct your inserting the disk along its guides. Last time I did that 4-5 months ago with 3 such disks, and one drove me mad, but did it at last: I simply tore off that rubber strip, and all was OK. I do not recommend you to be as violent as I was, but the problem may be there.
Where was the rubber strip? I can't see any on either of my drives.
I can dismantle the old 2.5" drive from its anti-static shield and fit the Seagate OK, it is just that misalignment of pins that is getting me. It slips into the recess OK but will not line up those pins if they aren't in the same place.
I'll see if I can con AppleCare into giving me a hint tomorrow, but this MacBook is unfortunately well out of warranty.
I am following the suggestion of the AppleStore "genius" in fitting this myself, but as usual there is always a catch.
The rubber strip was, at least with one of them (cannot remember which one or which ones) in the right side as you turn it up and having the disk slot in front of you. If you get a good light spot, you may see it or feel it with a thing screwdriver.
It was just a guess, I do not think the connection may have different sizes according to manufacturer, it must be a standard.
I was a bit off as I hadn't noticed the difference between the (4 power) pinned and unpinned HDDs. I just replaced a SAMSUNG old internal 2.5" SATA drive that had the pins with one that did not. The power pins were totally unused as the drive doesn't need additional power. Are the pins blocking entry? You could likely just find a way to remove them as they're not going to be used.
Thanks tnethers, I had a chat with a tech today and he was equally surprised that there was a difference but it is no problem.
The recess is large enough that there is no obstruction and those connectors are not used anyway.
So I fitted the hard drive in the anti-static shield and it slipped in fine and is now running. Better to have erred on the side of caution. If the drive is damaged, or worse gets jammed in that slot, no getting it out.