I'm having trouble figuring out if that drive is supported. Searching for ATDEA2A on Sony's web site (http://www.storagebysony.com) returns no results. Even Google has only one (cryptic) result for this model number. Sony makes several 130 GB standalone drives and several libraries incorporate them. Assuming it's a standalone drive, it should work with the drivers that come with 10.0 as long as it is on this list:
http://seer.support.veritas.com/docs/274347.htm
Backup Exec uses the device inquiry string to identify drives. On a SCSI attached drive, your SCSI adapter will generally output these when the system starts up. You'll notice that the compatability list I linked has the inquiry strings we are looking for listed in the file, so, for example:
SONY^^^^SDX-500C
Should be output by your SCSI card if you are using the SDX-500C 130GB SCSI drive. Also note that the compatability list uses carrots to represent spaces.