Data scrubbing is an error correction technique which uses a background task that periodically inspects memory for errors, and then corrects the error using ECC memory

ECC memory

Error-correcting code memory is a type of computer data storage that can detect and correct the more common kinds of internal data corruption...

 or another copy of the data. It reduces the likelihood that single correctable errors will accumulate; thus, reducing the risk of uncorrectable errors.

In RAID

With data scrubbing, the RAID

RAID

RAID is a storage technology that combines multiple disk drive components into a logical unit...

 controller periodically reads all the disks in a RAID array and checks for defective blocks before they are actually accessed by applications. This reduces the probability of silent data corruption and data loss due to bit errors.

In FPGA

Scrubbing is a technique used to reprogram an FPGA. It can be used periodically to avoid the accumulation of errors without the need to find one in the configuration bitstream, thus simplifying the design.