> for mSATA [...] you can get sizes up to 1TB and above if you want

I can't find ones above 1.0 TiB.

> real IDE SSDs are limited around 120GB

As you should know, 2.5" PATA SSDs are available with up to 480 GB.

http://eshop.macsales.com/item/OWC/SSDMLP480/
http://eshop.macsales.com/item/OWC/SSDMLP240/
http://www.google.com/search?q=KSD-PA25.1-256MJ


Edit: I've even found a 512 GB one:

http://www.google.com/search?q=FE8512MD2D
http://www.supertalent.com/products/ssd_product_detail.php?category=DuraDrive&type=105

[ Edited by Andreas_Wolf 31.01.2016 - 12:28 ]