Resolved Install 3 hard drives on iMac 2011 27" FAILED ...

yashiharu

macrumors newbie
Original poster
Aug 30, 2012
15
3
iMac2011.jpg


Before that, I am running MacOS on external TB SSD and internally a 256gb SSD (Bootcamp) & 3.5" WD 4T Re without any problem

Today, I got the 13pin SATA power splitter cable and install all 3 hard drives into the iMac.

MacOS SSD uses SATA 0
BootCamp SSD uses SATA 1 (share power to HDD)
4T HDD uses SATA 2 (get shared power from Bootcamp SSD)

That 4T HDD never detect in MacOS, the system shows no device connected to that SataII port

then I tried swap power cable & SATA cable with Bootcamp, same results - 4T is missing

Anyone got it works?
[doublepost=1548016903][/doublepost]it's sad ...
I love this iMac so much

What my plan is: internal MacSSD, WinSSD, Data + external SSD1 for photo & SSD2 for work ...
Can't even go through this step, not to mention I already got an eGPU set ...
 
Last edited:

RyanXM

macrumors 6502
Jul 7, 2012
394
399
DFW, TX
There are three power headers on the 27" Mid 2011 iMac (HDD PWR, SSD PWR, and ODD PWR). If you are going to share power, I would have the HDD on its own power header and then split the power coming from the SSD or ODD PWR header.
 

yashiharu

macrumors newbie
Original poster
Aug 30, 2012
15
3
There are three power headers on the 27" Mid 2011 iMac (HDD PWR, SSD PWR, and ODD PWR). If you are going to share power, I would have the HDD on its own power header and then split the power coming from the SSD or ODD PWR header.
Isn't SSD consumed more power than HDD?
ODD PWR is lowest and not enough to power up SSD/HDD, right?

So what you mean is:
SATA1 data <> SSDMac
SATA1 PWR (shared) <> SSDMac PWR

SATA1 PWR(shared) <> SSDWin PWR
SATA2ODD data <> SSDWin

SATA0 data <> HDD
SATA0 PWR <> HDD PWR

correct?
 
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yashiharu

macrumors newbie
Original poster
Aug 30, 2012
15
3
Isn't SSD consumed more power than HDD?
ODD PWR is lowest and not enough to power up SSD/HDD, right?

So what you mean is:
SATA1 data <> SSDMac
SATA1 PWR (shared) <> SSDMac PWR

SATA1 PWR(shared) <> SSDWin PWR
SATA2ODD data <> SSDWin

SATA0 data <> HDD
SATA0 PWR <> HDD PWR

correct?
it works!!

HDD @6G
SSDMac @6G
SSDWin @3G

everything works very nicely.
GPU temperature drops after cleaning all the fans

SSDs placed side by side vertically for best GPU heatsink cooling (i mean L & R)

sensor problems solved by MacFanControll perfectly

Now, I can move on to the next big thing - eGPU!

thanks @RyanXM
 
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yashiharu

macrumors newbie
Original poster
Aug 30, 2012
15
3
I would try to rearrange it so the HDD is on SATA1 (3G). The SSD's can take advantage of the 6G speed. The HDD can't, really.
oh. I am so stupid ...

I should mix the use of PWR and data cable ...

Let me change them later when I upgrade to wifi AC & BT4.2 card
 
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RyanXM

macrumors 6502
Jul 7, 2012
394
399
DFW, TX
Isn't SSD consumed more power than HDD?
ODD PWR is lowest and not enough to power up SSD/HDD, right?

So what you mean is:
SATA1 data <> SSDMac
SATA1 PWR (shared) <> SSDMac PWR

SATA1 PWR(shared) <> SSDWin PWR
SATA2ODD data <> SSDWin

SATA0 data <> HDD
SATA0 PWR <> HDD PWR

correct?
Glad you got it working! SSDs use less power during use than a HDD, especially newer ones.
 
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