Isilon ndmp DAR restore from a spanned backup fails with - Fatal Error reading archive Unrecogniz (4046746)

Performing a partial NDMP restore using Direct Access Restore (the default option) the restore job fails
with the following listed within the NetVault Backup log:

Job Message 2010/05/20 11:44:52 100 Data Plugin JFPSERVER02 Data transfer using a 'TCP' connection
Error 2010/05/20 11:45:33 100 Data Plugin JFPSERVER02 NDMP: ERROR 1274352331: Fatal Error reading archive: Unrecognized archive format: Inappropriate file type or format
Background 2010/05/20 11:45:33 100 Media JFPSERVER02 Mover has halted as all data has been transferred
Error 2010/05/20 11:45:33 100 Data Plugin JFPSERVER02 NDMP: ERROR 1274352331: Failed to read archive during DAR for index 0
Error 2010/05/20 11:45:33 100 Data Plugin JFPSERVER02 NDMP: ERROR 1274352331: Error extracting entry {/HDRI, /ifs/data/Archive/restore_test/HDRI} at index 0 of NLIST
Error 2010/05/20 11:45:33 100 Data Plugin JFPSERVER02 Data operation halted due to unrecoverable internal NDMP server error
Error 2010/05/20 11:45:33 100 Data Plugin JFPSERVER02 Error restoring data