my few hour battle with Q10, 6TB drive and copying files from Synology 412+:
Q10 does support large hdd - i have just installed WD 60EFRX, 6TB drive.
i needed to connect Q10 via USB A/B to my laptop (running Win

and initialize the internal HDD with GPT setting, but do not format at first (as only NFTS comes up, and Q10 does not like NTFS and 6TB). As next window popped up to format the drive i've choosen exFS (or exFAT not sure, but there is only once choice). after formatting the disc was visible to Q10 and Kodi and other tools.
i could copy the 2.5GB movie to it from my PC, and disconnected the USB cable. the movie was visible in Q10 i.e. in Kodi.
when you connect to your Q10 via Samba the only one folder show up - "share". the internal drive is available in /share/sda/. But the size of the internal HDD shows 1GB (as I guess it is a size of the SDcard).... thus i cannot copy any large movies to it. so i was stuck. especially as i have several large movies to be copied from my synology NAS.
so i hook Q10 up to synology via USB cable, and it was visible !!!! but Synology does not recognize exFS of this size (running DSM 5.2-5644 Update 2). i read there was an update in DSM 4.3 to support exFS, but only to 2TB. no further updates available for exFS.
but synology supports ext4 FS

. so i formatted the disk again (from synology console via USB connection) and copied one movie to it..... and now i see that Q10 and Kodi do not read the ext4.
what a mess.
i'll probably need to connect the Q10 to my laptop again, format it with GPT/exFS and copy all the files (few TB) thru my laptop. does not sound right. and will take ages.
anyone have any ideas how to:
1. make the Q10 smb share of the internal HDD, so it shows actual internal drive size ?
2. make Q10 read ext4 ?