Advice on internal drives needed.

It's been two months since I've been here. Things have changed!  I'm not sure what forum to post this in.
Besides my primary drive with just the OS and programs, I have in the case, a 750 GB drive that I'm outgrowing  and a 2 TB drive that is over half full. I will likely soon replace the 750 GB drive.
First question:
Are drives larger than 2 TB less reliable?
My primary drive (it came with the computer) is:
Seagate ST3300657SS SCSI
It is 277 GB with 122 GB used and 155 BB free. I have my PS scratch disk set to my 2 TB drive. I started working with my photos from an external drive recently because Lightroom ran much faster that way for some reason.
So my second question:
I have forgotten the type of drive that acts like a flash drive, one better not being defragmented? Regardless, what is the fastest drive (and reliable) for the primary drive?
And would that make much difference in actually running programs like PS or LR; or is it just faster when copying files etc.?
I'm Using an HP Z800 workstation at home with 12 GB ram - about a year and three months old; photoshop 5.5 and Lightroom 3.
Thanks for Advice

If you're concerned with reliability, look into "Enterprise Class" high MTBF drives, such as the Western Digital RE4 line (I have only these drives in all the systems here at my business).
The type of drive you may be thinking of is called an SSD or "Solid State Drive", which is based on flash memory.  They're generally very expensive as compared to traditional spinning drives.
Lastly, to radically increase performance as well as adding space, consider setting up RAID (e.g., RAID 0), which puts more hardware to work simultaneously.
-Noel

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