Unlike many here who have their own shop, I'm a contract worker jumping around larger corporate customers configuration & fixing their equipment.
Presently I service three large customers winding down from eight.
My largest is in the process of converting from Mac to HP laptop systems as they require USB-A ports in their systems for security key dongle's and other devices which prohibit the use of USB-A to USB-C conversion dongle's.
I will be starting up a mail-in service for MacBook's & MacBook Pro's beginning in 2018.
contact Info: dh_jaffe AT earthlink.net
Your system has two ports for drives: A 3.5” SATA III (6.0 Gb'/s) drive bay for a 3.5 HDD (or you could swap it out for a 2.5” SSD). And a second custom Apple PCIe/NVMe SSD blade interface.
Presently Apple offers a 2 TB PCIe/NVMe blade drive as the largest and Samsung offers a 500 GB, 1TB ,2TB,4TB or 8TB 2.5” SATA drive.So if you have the bucks max out the blade SSD with the 2 TB drive and throw in a 8 TB SATA drive for the deepest storage you could pull off internally! Or any combination!
The SSD runs a lot cooler than a HDD! You don’t need a second thermal sensor
The SSD runs a lot cooler than a HDD! You don’t need a second thermal sensor
You mean the inductor coil?
The trackpad is secured at the top edge. So you can’t get the click action along it. About halfway down is where you are expected to click.
The newer touchpad units which have taptic feedback are different
The newer SSPOLARIS x4 PCIe/NVMe is no slouch! Its the same as the Samsung 970 EVO & PRO SSD! So I don’t see the need to make such a jump and the reliability of the custom SSD’s beats using an M.2 SSD with these fangled adapters. FYI I’ve pulled out over a dozen putting in the correct SSD.
The amount of difference the Samsung 970 EVO Plus has over the older 970 SSD’s is only an improved sequential write. While its an improvement its not one you will likely encounter as needed for most of what your system does or offer any real saving. This is like arguing the differences between two top race cars performance differences, while trying to drive on city streets!
Remember we are talking about a the iMac here, not a MacBook Pro or air at least they are a lot easier to get to.
Your current blade SSD is 4 lanes. As to what you buy I would recommend you get the correct 4 lane PCIe/NVMe SSD Apple uses. (custom Apple SSD - Samsung SSPOLARIS series)
I too don’t recommend using other SSD’s with odd adapters in the iMac systems. At least in a MacBook you can get to them easily enough to replace as the adapters and SSD’s being sold don’t tend not to hold up well over time.
The old saying: You get what you pay for. That’s very true here! I have a very full drawer of used adapters and SSD’s that came out of MacBook Pro’s and iMac’s either replacing them with the correct SSD or finding alternative drive solutions depending on the system series.
As to the issues:
● Sleep mode won’t work correctly (MacBook Pro’s)
● Excessive CRC errors
● Garbage collection processes fail to work
● Wear leveling process gets corrupted when the drive is too full or has hight data I/O concurrently.
● Over provision blocks not used.
● General corruption - Not recoverable.
The blade SSD used in your system is not M.2 it’s a custom Apple SSD made by Samsung for Apple. You should stick with the SSD the system was designed to use. Review this great guide The Ultimate Guide to Apple’s Proprietary SSDs
Restart your system and press the Command (⌘) and R keys to enter into Internet Recovery. No need to back up the OS at all! But you likely want to backup your apps & data using TimeMachine first onto an external drive.
Reference: About macOS Recovery
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