New Brother DR630 Compatible Drum Unit. A great alternative to the overpriced original OEM drum unit. You will find a number of after-market drum units available. Here at the CartridgeStore.ca we tested most and narrowed them down to this model. We found that it provided the quality that our customers wanted and actually use these DR630 drum units in-house in our own offices. Each Drum Unit is pre-tested before being carefully packaged in the industry’s most protective packaging, making it ready to ship.