I've messed around with diskpart and bcdedit, disabled Secure Boot, Fast Boot, even tried CSM mode in the UEFI firmware.
#Can i move part of mac hdd to ssd free
Long story short, got the SSD, cloned the eMMC several times using Partition Wizard and Macrium Reflect v6 (both free versions) - Acronis 2015 from Crucial promo couldn't even read the eMMC at the beginning of the clone process LOL - tried to adjust partitions and just duplicating source drive, leaving huge amount of unallocated space on the SSD. I sent ASUS support an email, but I'm not holding my breath for a meaningful reply. I've done a lot of reading about Secure Boot and CMS in the UEFI, so I'm hopeful I can set the SSD to the boot device. Like I said, I'm planning on not deleting anything from the eMMC "drive," but still force the UEFI "BIOS" to boot from the SSD once I've cloned everything. I ordered an inexpensive Crucial SSD today, so we'll see how it goes. If I were you, keep it simple, leave the OS on the eMMC and use the SSD for everything else. Unless you know something I don't, I would not suggest attempting to delete any essential files of the eMMC. Im no expert but I definitely missed something. I cloned the drive perfectly, but as soon as I went to delete the old OS of the eMMC drive everything went to shit, couldnt fix it and had to return it, got a replacement, tried everything again being even more careful than before, and ruined it again. Okay be super super careful what you do next. I'm also wondering about drive letter conflicts. What did you do in the end: leave the eMMC alone, or nuke it? I was thinking leaving it alone would be a nice backup of the OS, etc. My only question was about setting the SSD to the boot device in the BIOS. I assume once it's installed and formatted, the system eMMC "drive" can be cloned to the SSD.
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I'm in the same boat with a new ASUS E402SA.