blank groove meaning in Hindi

Examples

1. Some low-end recording units economized by eliminating the feed mechanism, relying instead on the use of discs already cut with a narrow blank groove that guided the stylus, which simply impressed its vibrations into the upper region of the existing groove.
2. However, once word of " the secret message " got around among Rahsaan's fans, one would find that about 12 minutes into Side 4 appeared the first of two telephone answering machine messages recorded by Kirk, the second following soon thereafter ( but separated by more blank grooves ).