Bug report for Win'XP SP1 & SP2 and Win'2000 SP4.

> DVD-RW bug and my workaround:
>
> Over the last few weeks I've been battling a strange
> problem with my Pioneer A05 drive, which worked perfectly
> for a year until now. I could burn to dvd-rw media, but
> the drive would not read its contents after reinserting
> the same disc. Inserting the disc into my DVD-ROM drive
> reads it perfectly. I tried the drive in two other
> computers with different hardware and problem persists.
>
> I've since returned the drive to Pioneer for repairs.
> However, I decided to buy a new Benq 1610 dvd-rw drive.
> Believe it or not, same problem. I even exchanged it for
> another one, problem persists.
>
> I've read article 818733: "Windows XP Does Not Recognize a
> DVD-RW Disc" which is exactly the issue I have with two
> different dvd-rw drives now. It said it's because of the
> udfs.sys file. The workaround specified was to contact MS
> for a new udfs.sys file or install SP2. After installing
> SP2 for XP, problem did not get resolved.
>
> I installed Win'2000 Pro to dual boot with my XP Pro. No
> problem reading burned dvd-rw media (Maxell, Memorex,
> Optodisc, Princo). However, I noticed the problem
> returned after I installed SP4.
>
> After hours of hard work, I determined cdfs.sys was the
> cause of the problem. After installing SP4, I replaced
> its cdfs.sys file in the system32\drivers directory with
> the cdfs.sys that came with Win'2000 (no service packs).
> Rebooted and I am able to read dvd-rw media again.
>
> So I tried the same thing with XP with SP1, then SP2. I
> used the cdfs.sys file from Win'2000 Pro in my XP Pro and
> that also works.
>
>
>
> MICROSOFT: This problem is in cdfs.sys, not udfs.sys.
>
> Andy.