| 摘要 |
The invention relates to a method for safeguarding call charge data of a telephone exchange stored in a disc storage (PSP). According to the inventive method, individual data blocks (DB 1, DB 2,...) are read by the disc storage and are sent with the write orders to two sequential mass storages (MBS A, MBS B), e.g. magnetic tape storages, said mass storages being independent of one another. At each time, a data block (DB 1) read by the disc storage (PSP) is sent together with a write order both to the first and to the second mass storage (MBS A, MBS B) or is sent to another mass storage. After the arrival of an acknowledgement (RM 1A, RM 1B,...) the next data block (DB2) read by the disc storage is sent together with write orders to both mass storages both on the part of the first (MBS A) mass storage as well as on the part of the second (MBS B) mass storage.
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