A data tape storage cartridge for a data storage system that has a transponder for reading and writing data. The data storage tape cartridge includes a housing having a window and at least one wall. A panel is retained on the housing and configured to cover the window. A retainer is provided on the panel for the transponder. The transponder functions as an identification tag to which data is written and from which data is read to identify the data storage tape cartridge. The removable panel may also include a write protect switch that may be actuated to prevent a tape from being overwritten.