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I installed a new m.2 SSD in my Aspire E15 e5-575g-51gg and it is recognized no problem. I was able to install Windows 10 no problem - I used the Windows 10 Media Creation Tool to create a boot USB based off my license information installed on the original 500GB hard drive that came with the unit. Windows itself runs fine. Much more snappy than the Windows 10 on the 500GB mechnical drive. The PROBLEM is that the boot time has gone into the toilet. With the original 500GB drive, the boot time is something like a minute and a half (to get to the Windows login screen). The boot time of the m.2 SSD (with or without the 500GB drive still in the computer) is upwards of 5 min to get to the Windows login screen, no joke. It just sits there with the Acer logo and the spinning Windows 10 circle.
The drive is a Toshiba THNSN5128GPU7, 128 GB. Windows has no extra software - no Acer software, no personal software. I installed all the drivers (nothing in Device Manager is showing as "unknown" or as having a yellow warning).
I spoke to Acer tech support on the phone and they can't make any guarantees or provide assistance on hardware that did not come with the computer.