I have found how to align the partition of my SSD using fdisk (SSD article on Gentoo Wiki) but haven't been able to find any resources about aligning the partitions of a HDD. Is this practice necessary, or should I just let something like GPartEd align them as default? If it's something I should do to the HDD as well, where can I find a resource for the size to use for the sector and head portion of the command?
For future Googlers, I've found this article on the Arch Linux wiki that answers this question: "Advanced Format". As it turns out, there are a couple tools you can use to determine the sector size on your disk (smartmontools and hdparm). See the article for more information.