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Newbie
Posts: 2
Registered: ‎02-10-2016

Mac Mini - Sandisk Ultra II is not recongised?

Has anyone had any issues with the sandisk ultra ii in any of your upgraded mac's?

I put one into my late 2009 mac mini today and it wouldn't recognise it, so after refitting my old ssd and booted back in to OSX I proceeded to connect the Sandisk to a 3.5/2.5 desktop dock I have and it still wouldn't show up in Disk Utility?

I understand that this mini is SATA2, and the Ultra is SATA3 but I thought they're backwards compatible, but the fact it still won't show up in the external dock confuses me, is there any compatibility issues I have overlooked or have I been unlucky and received a DOA?

 

Thanks for any helpful info

SanDisk Guru
Posts: 4,548
Registered: ‎07-18-2007

Re: Mac Mini - Sandisk Ultra II is not recongised?

check it with another computer. If it is not detected there as well it is probably DOA

Newbie
Posts: 2
Registered: ‎02-10-2016

Re: Mac Mini - Sandisk Ultra II is not recongised?

Well I have finally managed to initialise it, however it happened because I placed it in the UPPER sata slot of the mini using my already installed 2nd HDD caddy which has a power connector adapter. This 2nd HDD kit used to house my mechanical 'storage' hdd, and the LOWER housed the SSD as is normal on the mini, however when I swapped them it appeared and I was able to begin installation?

 

I wonder if its a power issue, the old SSD that did work in lower slot is a Crucial M4, Rated +5 VDC and 2 AMPS, whereas the SanDisk is 5 & 1.6 AMPS, but to be clear I don't understand the numbers and/or if its insignificant?

 

 

But like I said, I find it pretty bizarre as to why it won't work in the lower slot, and although there is a threshold limit with SATA2 using a SATA3 drive, I'm getting 202MB's Write and 252MB's Read, which is slower than the older M4?

 

Thoughts?

Newbie
Posts: 4
Registered: ‎02-17-2016

Re: Mac Mini - Sandisk Ultra II is not recongised?

I just bought an Ultra II 960GB for my mini late 2012 with El Capitan.

 

Try enabling trim.  I was getting low results, after enabling trim it performed much better but still a tad lower than expected.

 

Check first if trim is enabled.  If not, enable it.

 

Remember to do benchmarks before and after.

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Newbie
Posts: 5
Registered: ‎05-30-2016

Re: Mac Mini - Sandisk Ultra II is not recongised?

Did you ever get this to work? I'm having issues, and I just posted some details about my MacBook Pro (and an iMac 27)t hat just would not work.