First the easy bit, the TLA of your drive is written on a sticker placed somewhere on the outside of the chassis. I think that in the case of the 24/10/40 it’s near the jumper configuration. If you take a good look at your drive you should be able to spot easily.
Now the tricky bit… go to My Computer (maybe in your desktop, in your start menu, trough windows explorer, etc.) right click on it and chose Properties. A little window with a monitor showing the windows logo should appear. click on the Hardware tab of that window. Then choose Device Manager. A new window will appear with a listing off all your hardware, sorted by type. Expand the tree for IDE ATA/ATAPI controllers, then double click either the Primary or the Secondary IDE Channel, depending on where your Plextor is. The third and final window will pop up showing you the properties for that IDE Channel, the DMA settings can be viewed/changed in the Advanced Settings tab.
If indeed as you say no such tab appears maybe DMA canÂ´t be turned off you the drivers for your controller. The entry for controller in my XP is: Intel® 82371AB/EB PCI Bus Master IDE Controller.
Anyway from my experience there’s no need to turn off DMA for flashing your firmware. At least not in my copy of Windows XP
Sorry about the lenghty explanation