The DDTT test scripts can access named buffers by way of device-dependent read and write operations. The named buffer is device-independent and may be used with different devices from within the same test script. A named data buffer is initialized by referencing the named buffer as part of a device-read operation. Data from a device can be read into a named data buffer and then written to another device or file. Comparison of two named data buffers and dumping a buffer to a log file is provided. Named buffer comparison and dumping operations are provided as device-independent functions.