I have two 750 gb sized drives in my hp envy dv7 and primary one (with Windows 10 upgraded from 8 => 8.1 OTA) recently started dying, I can see lots of reallocated sectors reported with some SMART monitoring utility so I wonder whether I should stick with conventional hdd/ssd or give mSATA a try
according to http://h10032.www1.hp.com/ctg/Manual/c03591253.pdf "32-GB mSATA solid-state drive for use only on computer models equipped with an Intel processor" so I'm not sure whether BIOS will support large sized (say 250 gb, for example Samsung 850 EVO MZ-M5E250BW) mSATA SSD and allow to reinstall (using HP Recovery) windows there
Lots of thoughts. The mSATA slot is generally only useable for an acceleration cache drive. There are only two ways to make the mSATA disk bootable. The first is if it is the only hard drive in the system and the second is an elaborate bootloader configuration where booting starts on the main drive and is handed off to the mSATA which holds Windows. I would replace the main hard drive with a 2.5 inch SATA SSD, and remove the mSATA disk. You will have plenty of speed. 500 gig SSDs can be had for around $125 now if you find it on sale.
anyway I decided to go the easier way and installed convenient SSD
the only problem I had was hp recovery failed to restore fresh OS installation with recovery usb drive created using windows 10 utility so I have had to clone the current OS using samsung migration tool