HD Technology Abbreviation

Hard Disk

When you save data or install programs on your computer, the information is typically written to your hard disk. The hard disk is a spindle of magnetic disks, called platters, that record and store information. Because the data is stored magnetically, information recorded to the hard disk remains intact after you turn your computer off.

High Density

Handheld Digital

Hazard Division

Head

The measure of the pressure of water expressed in feet of height of water1 psi = 2.31 feet of water. The measure of pressure at the base or other reference point of a column of fluid. Normally measured in feet of water. The product of the water's weight and a usable difference in elevation gives a measurement of the potential energy possessed by water.

Head-Mounted Display

Hemodialysis

Hemodialysis, also spelled haemodialysis, commonly called kidney dialysis or simply dialysis, is a process of purifying the blood of a person whose kidneys are not working normally. This type of dialysis achieves the extracorporeal removal of waste products such as creatinine and urea and free water from the blood when the kidneys are in a state of renal failure. Hemodialysis is one of three renal replacement therapies (the other two being renal transplant and peritoneal dialysis).

High Def

High Defenition