Error installing Win 10 - can't tell if enough space

[macenied]

It is the "Cylinder" Mac Pro, right ?

• Do you still have the Apple SSD and can you temporary work with 2 SSD´s in this machine ( the latter does not seem to look so good to me ) ?
• Did you also upgrade the RAM ( according to specs ) and do you have a "mixed" memory configuration now ?

 

[theSeb]

It is the "cylinder" mac pro, right ?

• Do you still have the Apple SSD and can you temporary work with 2 SSD´s in this machine ?
• Did you also upgrade the RAM ( according to specs ) and do you have a "mixed" memory configuration now ?

Yup, it's the cylinder Mac Pro.

It is the internal Apple SSD that I am having trouble with. It is in fact made by Samsung and based on the XP 941 flash storage with Apple's propriety connector.

I upgraded the RAM directly from Apple when I purchased it back at the beginning of 2014, so it's 32 GBs of "Apple" RAM, with 4 identical 8 GBs ecc modules.

 

[macenied]

Yup, it's the cylinder Mac Pro.

It is the internal Apple SSD that I am having trouble with. It is in fact made by Samsung and based on the XP 941 flash storage with Apple's propriety connector.

I upgraded the RAM directly from Apple when I purchased it back at the beginning of 2014, so it's 32 GBs of "Apple" RAM, with 4 identical 8 GBs ecc modules.

Good. So all is original and should work.

I´d recommend to visit

http://www.ultimatebootcd.com/

and create a bootable USB stick for further diagnostics / activities. Back up your system if you have not done up to now ( and in case you want to work with me on the problem ).

Boot from the USB stick and run a memory test for a few hours / overnight. If all is good you should test and wipe the SSD ( write a test pattern to the SSD and verify it, 1 pass [ 1 x complete SSD ] is good enough ). The SSD will be empty after that. Finally install OSX using Network recovery. If you need to define the partitions for OSX ( I cannot recall ATM ), use the defaults for this installation ( GUID, 1 partition, whole disk). Do not use any boot manager for this. Network recovery will create the EFI, HFS+ and OSX recovery partition for you. When it works you can change the SSD layout later according to your needs.