Abstract: In a system for buffering data, a buffer memory is provided for buffering data output from a data source to an asynchronous data store. When a storage medium is provided in the data store and its storage capacity is exhausted, the data still contained in the buffer memory might not be recorded on the storage medium. Independently of the physical storage capacity of the buffer memory, the logical storage capacity thereof is dynamically adapted to the storage capacity of the data store which is still available. As long as the available storage capacity of the data store is greater than a maximum physical storage capacity of the buffer memory, the buffer memory remains unmodified. When, however, the storage capacity still available in the data store becomes less than the maximum storage capacity of the buffer memory, its logical storage capacity is reduced so that all data intermediately stored in the buffer memory can still always be stored on the storage medium.