Vector Interlaced Disk Drive

Vector Interlaced Disk Drive.

1 - When a file is to be recorded on Interlaced vector, for example, three units, it is divided into two
parts so that each part is recorded on a separate drive. The vector interlaced requires at least three units
disk. Typically, vector writes the data to all units but one that is used for error checking.

2 - The program of the Company or vector performs a Boolean operation XOR the data recorded on the disk drives and
then writes the result of this operation, called a parity bit, the remaining unit. An XOR operation results in
bit 0 whenever two equal bits are compared, and 1 bit whenever two different bits are compared. Eg
applying XOR in binary numbers 1100 and 1010 arrives at the 0110 parity. If more than three units in the vector, the
two first XOR make the comparison and the result will be the third, and so on until the final result becomes
the last unit. This operation invalidates much of the performance achieved in the first stage, with simultaneous recording
the different parts of the file.

3 - When a file is read into a vector interlaced disk drives, the Company typically seeks each
in different parts of the file on disk drives that have been recorded.

4 - In the event of damage to one part of a file or disk drives, the controller performs the opposite
an XOR operation. Comparing the undamaged bits with parity bits, the controller can infer that the
missing bits are 0s or 1s. The information can also be used to repair data lost due to physical defect
in the media.

Source: Evolution of Computers