This type of coma is usually reversible once the blood sugar is corrected. Oxygen deprivation: Oxygen is essential for brain function. Cardiac arrest causes a sudden cutoff of blood flow and oxygen to the brain, called hypoxia or anoxia.
The external power supply is the AC power adapter that converts household AC electricity voltages to the much lower DC voltages needed to charge a mobile phone's internal battery.
Noun. 1. external drive-a drive with its own power supply and fan mounted outside the computer system enclosure and connected to the computer by a cable. drive - (computer science) a device that writes data onto or reads data from a storage medium. 1  Facebook. 2  Twitter.