Package
We boughted the OEM version of Pioneer 10x DVD Rom (DVD-104S), which included nothing more than the drive itself:

Installation:
I installed Pioneer DVD-104s into my PC. Since it is an IDE device I decided to make it slave on Secondary Bus (after Quantum 6.4 HD). So I changed drive settings to slave and after PC booted up it intentified as Pioneer DVD-104S 10x DVD Rom 0118 into both DOS and Windows. In Windows unchecked Auto Insert notification, checked DMA and reboot. The drive was November 1999 model with v1.18 firmware. After I booted in Win2k from drive properties I could set Region and change it only 5 times. I also used Drive Info v1.02 for testing the region status:

I connected to the Internet and found that a new firmware update was available. I d/l the update and flashed the drive with the newest v1.23. After more search I found that some guy made a region free firmware v1.23 for Pioneer DVD-104S!. I didn't waste any more time, d/l it and flashed it. After this flash drive was intentified as Pioneer DVD-104F 10x DVD Rom 0123 into DOS. Notice the DVD-104F<< letter. Drive was now region free!. However take notice when using that firmware. Read the instructions VERY carefully! ;)) You can also re-flash drive with future firmware updates from Pioneer (however region free will be lost until new region free firmware comes out.)

Test Machine:
ABIT BH6
Celeron 300A over clocked to 464 MHz
128 MB SDRAM PC 100
Quantum Fireball EX 6.4 GB UDMA
WD 18GB 7200 UDMA66
CL RivaTNT
CL AWE32
MS Windows 98 SE
MS Win2k 2195
Plextor UltraPlex 40max CD Rom - Firmware v1.03
Yamaha 8424s CDR-W - Firmware v1.0d
Sanyo CRD-BP2 CDR-W - Firmware Bc12
Pioneer DVD-104S DVD Rom - Firmware v1.23