The Sun 501-3113-04 Disk Board 501-3113-04, 270-3113-03 Rev.50 is in in stock at Calhoun Technologies. For over 10 years Calhoun Technologies has been saving companies likes your up to 80% off list price on hard to find computer hardware. Manufacturer: Sun Part Number: 501-3113-04 Details: Sun 501-3113-04 Disk Board 501-3113-04, 270-3113-03 Rev.50