Complex sentence: Similar in function to Native Command Queueing (NCQ), TCQ makes hard drive read and write requests more efficient by re-ordering them such that sectors nearest the current location of the drive's read/write head are serviced first.
Split into simpler sentences: Similar in function to Native Command Queueing (NCQ), TCQ makes hard drive read and write requests more efficient by re-ordering them. Typically, sectors nearest the current location of the drive's read/write head are serviced first.