get a sata ide raid card
A variable frequency drive (VFD) refers to AC drives only and a variable speed drive (VSD) refers to either AC Drives or DC Drives. VFD's vary the speed of an AC motor by varying the frequency to the motor. VSD's referring to DC motors vary the speed by varying the voltage to the motor.
A variable-frequency drive (VFD) is a system for controlling the speed of a rotational or linear alternating current (AC) electric motor by controlling the frequency of the electrical power supplied to the motor.[1][2][3] A variable frequency drive is a specific type of adjustable-speed drive. Variable-frequency drives are also known as adjustable-frequency drives (AFD), variable-speed drives (VSD), AC drives, microdrives or inverter drives.
For Raid 5 all the hard drives have to be of the same speed.
Torque mode in variable speed drives is where the drive adjusts its torque according to the input. The speed/velocity mode is where the input is used to control the motor's RPM.
Frequency drives are an adjustable-speed drive used for electro-mechanical drive systems. They control the motor speed and torque by varying motor input frequency and voltage.
An AC drive is a type of adjustable-speed drive used in electro-mechanical drive systems to control AC motor speed and torque by varying motor input frequency and voltage. AC drives are used in applications ranging from small appliances to the largest of mine mill drives and compressors.
CD drives are supported via a class driver; the operating system does not care what speed the drive is.
A variable sped drive is sometimes also known as a variable frequency drive. These drives are used in electro-mechanical drive systems to control AC motor speed and torque.
That would depend on the speed you were going at. Since one never drives at a constant speed, it would have to be an average speed.
The RPM of your hard drive. A 7000RPM drive is faster than a 5000RPM drive, and an SSD is faster than all Platter hard drives.
Average sustained speed of 40 mph.
Hard drives can make a big difference in computer performance. Consider a solid-state drive if you need quick drive access.