It's possible to buy M.2 SATA drives of 1TB capacity. Are they likely to work? MINIX's page for the NEO G41V-4 seems to suggest that 512GB is the max, but is that really true? Is there some kind of technical limitation here that someone could explain to me?
I'm going to go out on a limb with a very generalised answer lol, and obviously this is purely my personal opinion & certainly not the official standpoint of MINIX themselves.
From previous information elsewhere etc., I think one of the main reasons why they only officially test SSD's up to a certain size (such as 512 GB) is based on what they'd "reasonably expect" which upgrades the
average user of these products may potentially consider purchasing or actually go ahead with for these relatively cheap mini PC's with all things considered.
(Very happy to be corrected if wrong & it would also be extremely useful if the information could be provided in this thread if SSD's > 512 GB categorically can or cannot be used in the N42/G41/J50 too, however 
.)
Otherwise, bear in mind one of their primary purposes is to make these very affordable mini PC's easily available with either a 32 - 64 GB eMMC as standard (SSD optional), & a licensed OEM copy of Win 10 Home/Pro also pre-installed ready to go right out of the box. Going with a 32 GB eMMC (where applicable) meant significant savings indeed could be passed on to end users due to the very low licensing fees required.) It's improbable that there is a particularly high demand for such large SSD's in these little mini PC's. (In fact, I can only recall 1 or possibly 2 other people previously asking about the use of M.2 SSD's that large.)
Additionally, as examples, the N42-C, G41V-, or J50C- (4) models which all have M.2 SSD expansion slots also all have significant options for directly adding the extra storage/expansion via their USB ports, or over a network as well, (such as NAS).
512 GB M.2 SSD's (or greater) were also really quite pricey when these devices were designed or initially released too. M.2 SSD prices have continued to drop but depending on certain specifics, a high capacity SSD may end up costing nearly as much, or actually more than the devices themselves which may also potentially put end users off that sort of expense.
MINIX not having tested SSD's any larger than 512 GB in the above devices "might" not necessarily mean they wouldn't function either. There's a chance some could possibly work, but obviously the expense or hassle of purchasing one with a risk that it may not even be detected, let alone function, is what will immediately put the majority off & rightfully so. (Another user posting up details of whether they successfully tested such a large SSD may be your only way of knowing too if they already happened to own one to test it out perhaps?)
However, if you're using your MINIX mini PC for a highly specialised purpose (as some do), or the increased internal capacity is a genuine requirement for you, I'd suggest emailing MINIX support directly. (Include full details/info, and/or the link to your post here too if you wish. Just be prepared for the response that the data you already have is the maximum they'll stick to)....
support@minix.com.hk
