Plextor EXTERNAL PX-504UF 4X/2.4X/12X (PX-504UF/SW) Plextor 4x2.4 DVD+R/RW &amp; CDRW USB 2.0/FireWire External Drive General Features: USB 2.0 interfac IEEE 1394 FireWire interface 4x maximum write speed (DVD+R) 2.4x maximum rewrite speed (DVD+RW) 12x maximum read speed (DVD) 16x maximum write speed (CD-R) 10x maximum rewrite speed (CD-RW) 40x maximum read speed (CD) 2 MB buffer 140 ms average seek time (DVD) 120 ms average seek time (CD) Buffer Underrun Proof technology