Disk drive will not read or play any disk / dvd?

If it can read any other disk, you should burn your disk again because burning process was incorrect. your computer can't recognize the disk. In this case, probably you can't do anything, no way to try to read a bad disk if computer can't even "see" it.
By the way, you should test to read the disk on some other computer.
If happens with ALL your disks, your optical player is defective.
Again test reading with other computer if record was made correctly
As for your device, you should check if worth to repair and decide if repair or replace it.
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if there is no disc in the size is 0 bytes so it will show full, try other disks

Does the disk drive play the disk? If not, the drive could be faulty. If not, then the disk can bec copy protected

have you tried a cleaning disk?if not get some cleaning alchol wipe the disk leave a little on it not much,insert the disk ,this might clean the lense.

Can be several reasons
1. Disk is upside down
2. Lens is durty. Use CD/DVD cleaning disk
3. Disk is recorded in higher speed than your driver can read (for instance reading speed is 16, but disk is recorded on 24).
4. DVD drive is damaged or not connected properly.
Good Luck

Usually HPs are good with +R DVDs unless things have change over the last year or two.

Whats the model number on your computer?

If it is a hardware fault, a fault in your drive, it occurs on every disk
if it is a disk fault it occurs only when faulty disks are used.
Probably Netflix discs are bad, wrong region code, or scratched, or badly copied

Aquarius0128 there are two things to consider here.. dvd's recorded on a computer need to be closed/finalized after you have recorded onto them in order to be used on a stand alone player.. they will play ok on original recorder because of the design of these machines finalizing prepares the structure of the disc so it can be recognised by other players as a dvd video disc.. you will usually see a 'finalize disc' option in your recording program

Second issue is this.. even if finalized an older (or even some modern) stand alone players will not recognise a recorded disc made on a computer or even if it can there are different formats DVD+R DVD-R and even DVD-RAM and DVD-RW (the two latter ones are rarely recognised outside a computer)

MPEG-2 video is the file format you’ll need to convert to, but you cannot simply burn the MPEG-2 to a DVD and automatically play it in a DVD player.
The easily way is to buy software that will make the transition smooth; I recommend VSO Convert to DVD.

I updated my firmware from 1413 to 1416 found on avforums. This is for european units. I suggest you also complain to Toshiba Japan as there are known issues with the xs32. We all need a firmware update. See AVforums.

My unit will not recognise RAM discs anymore - even those that I had previously used.

Have you thought of replacing the DVD drive. See AVforums.