With direct or hashed access a portion of disk space is reserved and a 'hashing' algorithm computers the records address. So there is additional space required for this kind of file in the store. The records are placed randomly through out the file. The records are accessed by address that specify their disc location. Also, this type of file organisation requires a disk storage rather than tape. it has an excellent search retrieval performance, but care must be taken to maintain the indexes. The files in his type are stored in direct access storage device such as magnetic disk, using an identifying key.
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