I’ve been using several NEC and Optiarc (PATA) drives on JMicron controllers for a few years and have never had any problems.
Recently i upgraded my PC and fitted a Gigabyte GA-X48 DS4 motherboard (X48 chipset), it has the same Jmicron controller as the the previous board a P35 chipset board, but my god i had loads of problems this time around.
Checked with Vista and XP the results were always the same.
Checked with different versions of CD-Speed including some very old versions, the results were still the same.
Tried 5 different versions of the JMicron drivers and even used MS default PATA drivers.
The burst rate was 38MB/s so that should have been fine and the drive was reported to be in UDMA 4.
I began to think my AD7200 had developed a fault. To confirm, the drive was connected to another PC and found the drive was perfect.
Pic 1 AD7200A on Jmicron (Gigabyte GA-X48-DS4
Pic 2 AD7200A on an ICH7 PATA controller.
Both tests with the same disc.
Anyone else having similar problems?