When you buy blank DVDs CDs or BluRay discs, you have no idea who makes the disc. With a few exceptions, most name brand media blanks are not made by the company itself. The manufacture is outsourced.
Sony discs are made by Ricoh, Mitsubishi, Taiyo Yuden. Philips discs are made by CMC and Ritek, Mitsubishi. TDK are made by CMC, Ritek, Ricoh, Maxell. Memorex are made by CMC, Ritek, Prodisc, Infodisc, Moser Baer. The list goes on.
If you can't tell what make of disc you're buying, how can you assess the quality? The blanks don't have a manufacturers ID printed on them. But they do have a Media ID Code embedded in the disc, if you have the software to read it.
On Debian or other Linux distros, you should have dvd+rw-tools installed. If you haven't, its easy to pull down.
apt-get install dvd+rw-tools
Once installed, place a disc in your burner and run the following:
I tested a Verbatim DVD. This is what I got:
$ dvd+rw-mediainfo /dev/cdrom
INQUIRY: [PIONEER ][DVD-RW DVR-216D][1.06]
GET [CURRENT] CONFIGURATION:
Mounted Media: 1Bh, DVD+R
Media ID: MCC/004
Speed Descriptor#0: 00/2295103 R@20.0x1385=27700KB/s W@20.0x1385=27700KB/s
Speed Descriptor#1: 00/2295103 R@16.0x1385=22160KB/s W@16.0x1385=22160KB/s
Speed Descriptor#2: 00/2295103 R@12.0x1385=16620KB/s W@12.0x1385=16620KB/s
Speed Descriptor#3: 00/2295103 R@8.0x1385=11080KB/s W@8.0x1385=11080KB/s
Speed Descriptor#4: 00/2295103 R@6.0x1385=8310KB/s W@6.0x1385=8310KB/s
Speed Descriptor#5: 00/2295103 R@4.0x1385=5540KB/s W@4.0x1385=5540KB/s
READ DVD STRUCTURE[#0h]:
Media Book Type: 00h, DVD-ROM book [revision 0]
Legacy lead-out at: 2295104*2KB=4700372992
READ DISC INFORMATION:
Disc status: blank
Number of Sessions: 1
State of Last Session: empty
"Next" Track: 1
Number of Tracks: 1
READ TRACK INFORMATION[#1]:
Track State: blank
Track Start Address: 0*2KB
Next Writable Address: 0*2KB
Free Blocks: 2295104*2KB
Track Size: 2295104*2KB
READ CAPACITY: 0*2048=0
Media ID: MCC/004
Check the code online and you can confirm its made by Mitsubishi Chemical Corp. A premium quality manufacturer.
If you run Windows, you can get a free util DVD Identifier. I haven't used it. It is free. Its DonateWare.