70K views · 167 reactions | What is horizontal directional drilling?...

Horizontal Directional Drilling (HDD) is a trenchless method for installing underground utilities such as pipelines, cables, or conduits without excavating large trenches. The process begins with a pilot bore, where a drilling rig creates a small-diameter, precisely controlled borehole along a predetermined path. Once the pilot bore is complete, the borehole is enlarged by back-reaming to the desired diameter, allowing the utility to be pulled into place. HDD is highly versatile and suitable for

Solid state drives are getting more affordable, according to TrendForce's DRAMeXchange, which could mean fewer hard disk drives going forward. But what's the difference between SSDs and HDDs? PCMag's Joel Santo Domingo explains. http://bit.ly/1jTRduU | PCMag