I recently purchased a 21.5 inch iMac (2019 model) and am confused as to whether or not this computer has a rotational HD.
Viewing the two attachments will show you what I mean.
iMac 21.5", macOS 10.15
You have Fusion drive -- 32GB (?) PCI-e SSD with 2.5" 5400 RPM "1T" Rotation Hard Drive.
Click on the "NVMExpress" section of the System Profiler to find the information about the SSD in your iMac.
Here is an Apple document describing the Fusion Drive.
samtenor wrote:
SATA interface -- that SSDs would take regular hard drive forms (2.5" mostly, some 3.5", however, the transition of mSATAs are blade shape) - limited to speed 6GB/sec with SATA 3.
PCI-e in Mac is NVME -- blade shape SSDs -- which provide way faster than SATA and also would save the space.
Apple SSD guide
Not quite accurate. PCIe is a newer controller that can operate at much faster speeds than an older SATA controller. However, some PCIe SSDs can be SATA based (which means they are limited to the slower SATA speeds even when used on a PCIe controller). The faster PCIe SSDs are based on NVMe drives and are at least 2x faster than a SATA SSD.
SATA interface -- that SSDs would take regular hard drive forms (2.5" mostly, some 3.5", however, the transition of mSATAs are blade shape) - limited to speed 6GB/sec with SATA 3.
PCI-e in Mac is NVME -- blade shape SSDs -- which provide way faster than SATA and also would save the space.
Thank you!
I don't understand what PCI-e SSD refers to, though.
Is HD rotational or SSD?
