I am getting somewhat confused (sometimes it doesn't take much)

Ok 1st:  From Lenovo's website

Memory:

TINY FORM FACTOR WITHOUT SACRIFICING PERFORMANCE

This article may answer most of your questions:   Building The Ultimate Windows 10 Micro PC (Lenovo M900 Tiny)

This did help, the pictures on the 2nd page made the drive bays very clear, the M.2 slot next to the memory slots which are both under the main drive bay. It did give some understanding that the bigger memory chips seem at least at this time are limited and hard to get so may be why lenovo doesn't offer bigger/better/more flexible options.  It seems the best way to go as far as memory and drive storage is to go the least possible and then do the upgrades to what you want later, for example go with 4gb memory and then upgrade to 1 16gb chip after purchase then if you want to go 32gb you only have to toss a 4gb chip. I may be off base here but it seems the way to go would be the M.2 1TB SSD card for the main drive (Not sure if this one would be combatable but: 

SAMSUNG 960 PRO M.2 1TB NVMe PCI-Express 3.0 x4 Internal Solid State Drive (SSD) MZ-V6P1T0BW

so again you would want to go with the least expensive (wasteful) drive option. Note: This is a new drive not released until 12/31/16 I may be wrong but this would be the fastest drive option, they have a 2TB option as well but its getting a bit pricy at that size)

Thanks for the Help

Bill

I have seen this on a few reviews but not on any pictures on the Lenovo website, what is it ? something thats no longer offered...... It looks like a BNC connector or a cable connector.........

Thanks

Bill

The Hardware Maintenance manual can answer some questions.   The rear view of the product on pg 29 says it is a WiFi antenna cable connector ... available on some models. 

Mod edit:  Please keep related posts together in the same thread (avoid fragmenting the forum.)  Ty. 

Thats what I thought it was, sort of looks like the wifi connector you see on many routers that use the little 90 degree ant. It does not appear to be used on the current model.  I guess they found a better way to go.

Thanks

Bill

I see a couple of I/O boxes on the US Lenovo website (strange these don't seem to be available on the Canadian website)

anyway they both seem to be just extra usb ports, serial ports etc, now there seems to be the option when buying the computer to add a dvd, I assume this is the expansion box that is shown in the youtube video that shows it can be used for a dvd or a hd I may be wrong on this, the website does not seem to list the dvd expansion box separatly. 

Any insights on this ?

I am not sure if this video is for an older version or the M900

Thanks

Bill

I'm not familiar with the expansion box myself, I would use a quality USB 3.0 hub to add more ports.   And if all you need is the occasional use of a CD/DVD drive, most people get a generic USB connected external drive to use on those occasions.  

The expansion boxes just adding ports I was not really very interested in, I already have a 13 port + 2 charge ports usb 3.0 hub but the idea of having the box that allowed for a dvd or hd was kind of appealing. Although its not really a "make or break" sort of thing lets face it you don't really use a cd/dvd very often these days.

Thanks

All the Best

Bill

I wonder if anyone has had any experience in customizing their M900 at the time of purchase with items outside the box? I know there are some selections you can make on the website but I am curious how open Lenovo is to making custom choices that are not selectable on the website and what others experiences were in doing that. I am not really looking for anything really weird mostly memory and SSD card. I plan to call Lenovo next week after the holidays are over and see but would like opinions if there are any. ie easy, open to mods, impossible take what you get.

Thanks

Bill