Gary Scotland wrote:
You don't appear to understand what the poster has asked or what is the widely accepted solution.
There are caddies that would do what the OP wants.
Yes there is, that is why I included an image of it which you have just reposted.
just to be able to use something fairly limited compared to a 2.5” SATA drive
This upgrade work is to place a 2.5" drive inside a MacBook, how is that in any way limited?
It could make sense if one finds a great deal on an SSD. Or just a “this is so crazy it just might work”project.
There is nothing crazy about replacing an optical drive with a hard drive or an SSD, the parts are readily available and an accepted economic modification thats works effectively, not might work.
I perfectly understand what the OP is looking to do. It's to install a 16-pin 1.8" micro-SATA (my emphasis) drive into the current optical drive space. That would require a 2.5" SATA to optical bay caddy/adapter, along with some sort of 1.8" micro-SATA to 2.5" SATA enclosure/adapter. However, the adapter linked has an inaccurate description as "Mini Micro SATA MSATA". The photo of it make it look like it's micro-SATA.
I think something like this would be a better choice since it includes a 2.5" SATA form-factor enclosure.
Amazon.com: SSD 1.8 Inch Micro Sata to 2.5 Hard Drive Caddy Adapter: Computers & Accessories
This is mSATA (26-pin). The third photo shows an mSATA drive installed in the enclosure with the cover off.
http://www.legitreviews.com/addonics-ad25msd-msata-to-2-5-inch-sata-drive-enclos ure-review_141758
And here's where a lot of the confusion lies with the naming:
https://en.wikipedia.org/wiki/Serial_ATA#Micro_connector
https://en.wikipedia.org/wiki/Serial_ATA#Mini-SATA_(mSATA)
Now, maybe the OP is thinking of mSATA, which is only for SSDs. It's also called mini-SATA, which gets confusing because it's smaller than micro-SATA. Here's a discussion by someone who ordered the wrong part with all the naming confusion:
http://www.tomshardware.com/forum/293561-32-msata-microsata
But like I said - it would be a lot of work to go through two caddy/adapters when it would be easier to use one caddy and a 2.5" drive.