Bigger iMac flash storage questions

[robgendreau]

I assume if one buys a current iMac with the CTO option for a 3TB drive one gets 128MB PCIe connected flash and a 3TB HDD, correct?

But what about the other options, 256, 512 and 1TB flash? is that all PCIe, or a combo of the 128 PCIe and a SATA SSD? Seems unlikely since the totals are off.

And when you do a CTO build of flash only, does it just leave a hole where a HDD could go? I realize it's not easy to retrofit, but doable. And BTW, on an iFixit guide I saw mention of a SATA connection to flash memory installed behind the logic board; is the flash even PCIe anymore?

 

[kendrickhphoto]

All of the flash storage is PCIe SSDs there are no spinning disks. The fusion drives have both that's why they're called fusion drives. The all flash options do have a space missing where the hard drive would go but they lack the connectors for the SATA drives.