Re: [Trisquel-users] Lenovo T420 with Windows 10 not recognizing USB dongle

[xliang9550]

There is a workaround: remove the optical drive and purchase a 2nd HDD  
adapter, and subsequently install the HDD with Trisquel in said adapter. T420  
accepts optical drives/2nd HDD adapters with thickness up to 12.7 mm, so  
every SATA-based HDD adapter fits  in its optical drive bay (Ultrabay  
enhanced).

One thing to mention is that Sandy-Bridge-based ThinkPads (X220, T420, W520)  
don't boot from GPT disks using Legacy BIOS mode provided by original UEFI  
firmware. You may need to flash coreboot to replace the UEFI. Thankfully, it  
doesn't have Boot Guard. For most ThinkPads, I'd like to use GPT but install  
OS using Legacy mode (with a BIOS Boot partition). However, this doesn't work  
on some platforms, including (but may not limited to) Sandy Bridge and  
Skylake.