The order in which entries were added to the dataset is the order in which they are stored in ESDS files. The records may be located using their physical address, which is also referred to as their RBA (Relative Byte Address). Assuming that each record in an ESDS dataset has sixty bytes, the RBA of the first record would be zero, the RBA of the second record would be sixty bytes, the RBA of the third record would be one hundred twenty bytes, and so on.   Access to records may be made in a sequential fashion using RBA, which is also known as addressed access. The data is saved in the same order as it was input into the system. The most recent records are appended to the end of the list. The ESDS dataset does not allow for the deletion of records; nevertheless, such records may be tagged as inactive. The length of records in an ESDS dataset may either be variable or fixed.