Booting from one of two SSD in a laptop: Why so difficult?

Comdrpopnfresh

Golden Member
Jul 25, 2006
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I would like to resolve the issue(s) I am having; but, am at least interested if it would be consistent amongst current Windows 10 compliant/certified/approved laptop systems, or a quirk of the model I use:
An ASUS N550, of which I removed the ODD and installed a second SSD. I presently have Win10x64 independently installed on each drive (though the current working boot state require some redoing and ordering of installs). *The primary is GPT and the secondary ended up being MBR, so I think the issues may stem from one drive having a dependency on the utility/boot partition on the other shared by both.

The primary drive receives preferential boot-ordering from the mainboard, such that cold boots and otherwise non-restarts end with the bootloader disregarding my button mashing for bootable device selection. I have to let Windows on the primary SSD boot, and restart the machine to then select the secondary drive. Even hibernation states on the secondary SSD are ignored/lost/discarded on the next boot. Similarly, I cannot hibernate and persist the working state of the primary SSD to boot the secondary... Unless I intend on booting from a hibernated primary SSD OS state back into the same, the functionality and (my expectation of the) flexibility are lost.
I haven't been able run the secondary drive, a Samsung 840 EVO, with BitLocker.
The largest potential risk I have already experienced is a Cumulative Windows Update to the one disk + OS causing the other to unbootable or inoperable. This happened in Nov. with the 1511 update. I installed on the secondary, and couldn't boot the primary. I had to reinstall both OS instances, and humpty-dumpty two bricked file systems back together.

Has anyone else experienced similar difficulties in a dual-disk, dual-boot (laptop) situation?
Seems that this will need to be addressed by manufacturers soon, as generic consumer models of 5th-gen Intel Core systems and higher are shipping with an empty ODD bay and a blank cover.
Maybe the solution is waiting for multi-TB SSDs to swap in as a primary, dual-boot from, and any remaining SATA or similar bays/slots set as backup storage?
 

corkyg

Elite Member | Peripherals
Super Moderator
Mar 4, 2000
27,370
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Every laptop is different. To do what you want to do on my Lenovo Thinkpad, I would have to tap F12 at the initial splash screen. That would bring up a list of all drives and let me select which one to boot from.

Normally, laptops, as currently designed, can only host one OS drive. The ODD space is normally used for a data drive.