My Book Studio Chipset: 4KB cluster support, capacity limitations, SATA transfer speed?

WD External Drives External Drives for Mac
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I own a Western Digital My Book Studio, WDH1Q10000E.
Connectors: eSATA, USB 2.0, Firewire 400 and 800.
Housing: The original (as purchased) Western Digital 1 TB 3.5 inch SATA disk.

Is it possible to install a new disk into the case…?
…considering physics:

  1. Any 3.5 inch SATA drive? Height limitations?

…considering the built-in controller bridge:

  1. Brand restrictions: WD drives only, or also 3rd parties allowed?
  2. What is the maximum supported disk capacity? 2TB drives or more possible?
  3. SATA transfer rate restriction? 1.5 / 3 / 6 Gbit/sec?
  4. Any issues with certain hard disk cluster sizes? Is the new 4 KB cluster size, the so called “Advanced Format”, supported? Such as in the WD EARS series?