For the Maxtor D540X:
Speed: 5400 RPM; Seek time: 9 ms (Avg); Cache Buffer: 2 MB Warranty: 3 Years
For the Seagate ST340823A:
Speed: 5400 RPM; Seek time: 8.9 ms (Avg); Cache Buffer: 1 MB Warranty: 1 Years
Based on the specs, it appears that the Seagate drive has a "slightly" faster access time. However, the warranty isn't as good and the buffer is wimpy. I'd go with the Maxtor if you're deciding between these two.