As the name implies the BD stands for Blu-ray, and ASRock has packed a full blu-ray drive into their ION330HT machine. That is the only difference here between the ION330-HT machine. Here is the spec sheet:
| Processor | Atom 330 (Dual Core) |
| Memory | 2 GB (2x1GB) (4GB Max) |
| Hard Drive | 320GB 5400RPM SATA |
| Video Ports | 1 VGA, 1 HDMI |
| Other Ports | 6 USB, 1 eSata, 5 jack Audio Port, 1 Optical SPDIF Out |
| Operating System | None |
| Wifi | 802.11b/g/n |
| Optical Drive | Blu-ray Combo Drive |
| Included Accessories | Media Center Remote |
Prices vary, but are around $550 and available at:
Amazon:
Newegg:

