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Modello metà 2010, A1278 / processore Core Duo 2,4 o 2,66 GHz

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Optical Bay Internal SSD recognized only after PRAM reset.


I replaced my Optical Internal CD player, with a SATA adaptor for SSD.

I’m using this SSD as a second internal memory, the OS is still on the primary slot.

The new SSD ( ADATA SU 800 - 256 GB) is working properly but when I turn off the Mac and I turn it on again, the SSD is not recognized. If I reset the PRAM when turning on the Mac, the Mac Recognizes the SSD. What can I do, to avoid PRAM reset every time I turn the Mac on? Because for now, this is the only solution.

Thank you

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You’re hitting a common issue! You are using a fixed speed SATA III (6.0 Gb/s) SSD within a SATA II (3.0 Gb/s) system.

While it may appear to work the system looses connection with the SSD as its too fast for it.

You’ll need to get another SSD which is either a fixed speed SATA II (3.0 Gb/s) or is auto sense so it is able to match the speed of the system. As an example the Samsung 860 EVO SSD. Note the spec sheet lists out support for all three SATA specs!

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Thanks, Dan!

If I keep using the ADATA for a bit, resetting PRAM on every power on, should it be a problem? Why this difference in speed lecture cause problems just turning it off and after resetting the PRAM is working fine?



You run the risk of file corruption, I don't recommend continue use.

Think of it this way... You wouldn't hold a gun to your head even if it only had one bullet as the risk of getting hurt is there!

Resetting SMC is not going to change anything.


Cool, I will order the Samsung 860 EVO SSD, it should fit properly with the adaptor, isn't it?

And If I'll use 500 GB should it work properly or is too much?



Depending on what you currently have in the HD bay, you might want to consider moving the Samsung drive into it and make it your boot drive. Or just go with a bigger SSD and just put in the single drive (less hassle moving files around).

The reasons are the newer SSD's are just better! And depending on your current drives condition it maybe getting worn out! Unlike HDD's SSD's have a limited over-write limitation.

In any case the Samsung drive is a standard 2.5" unit.


Now as a boot drive I have a 120 GB TOSHIBA-TR150. I prefer to keep using this one as a boot drive and moving almost all the files inside the secondary new SSD, just to avoid backup, time machine, installing a new OS, etc... do you think it's a good idea?

Also, someone told me about change the ribbon connector, what do you think about it?


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