Yesterday, 07th Aug, 2002 [note: was 2003…], the 3rd person on this forum managed to damage a LiteOn writer beyond repair using WSES not carefully enough.
That’s why I now, 01:15-02:10 in the morning, write this guide about how to use WSES, and how not to use it.
WSES does not only allow scanning for C2 errors, as Nero CD Speed -> ScanDisc does, it even allows scanning for C1 errors. Therefore, it offers a much more precise way to check the writing quality (or being more precise: the readability) of a CD.
Most functions of WSES will only work with LiteOn writers. According to idiot@ace, the drive exercise -> read c1/c2 count" will only work with Asus writers.
Please read the whole thread. idiot@ace explained some of the other tests.
C1 and C2 errors are not really on a CD. They occur during reading. The more difficult it is for a drive to read a disc, the more errors occur while reading that disc. A good disc should report low error rates even at high scanning speeds. A C2 error occurs if too many C1 errors occur to be corrected on “C1-level”.
But don’t forget that a bad disc can also have low error rates after burning, and a very durable, UV resistant disc might have higher error rates than a bad disc, if your writer simply dislikes certain types of media. A LiteOn 40x e.g. won’t write to Mitsui media, although it is high quality media.
A good disc will not increase error rates if you put it into direct sunlight, while a bad disc will suffer damage then and/or may degrade after some months.
Therefore you should be very carefully if you try to conclude the quality of a disc only from such scans here: For a fresh-burned disc, such a scan will only show if the burn was done properly or not. To test the quality of a disc, you must do further test.
If you got WSES.zip, extract it to a folder which can be easily accessed from MS-DOS! Therefore, you must extract it to a drive with a FAT16 or FAT32-filesystem, but not NTFS! You should not use paths such as
“h:\windows2000\programs\burning+scanning ools\liteon\wses” either. This would only cause headache when accessing from MS-DOS.
How to use WSES?
Now boot MS-DOS. You can also use Windows 98 -> dos prompt mode or the Windows 98 boot CD.
WSES will not work in a ms-dos window of any version of Windows.
Do NOT load any CD-ROM drivers!
There is a program called “ST” included in the package. After booting MS-DOS, select the directory of WSES.
on my pc, it is c:\wses, so i type
Now i’m in the directory of wses.
From now on, you can make a screen shot whenever you want pressing ctrl+alt+t. The file will be stored in PCX-format and will be named WSES01.PCX, WSES02.PCX etc.
You will get this:
First, you will have to select your drive in the setup-menu. Make sure you select a LiteOn writer.
Do NEVER ever, under no circumstances, execute the CLEAR EEPROM command from the Utility-Menu:
You will have a hard time to repair it!
Now it’s time to start the first C1 scan:
Select “Disc Measurement” -> “C1/C2 Measurement”
You can select the range to scan (from start min : start sec : start frame till end min : end sec : end frame, where 1 second has 75 frames => set end min to 74, 80, 90, 99 or whetever type of disc you want to scan), the scale of the picture (set C1 scale to 50 and C2 scale to 20 for a good disc), and the read speed. A read speed of 48x might lead to crap results. So do not go over 40x here.
Note that you must eject and reinsert the CD if you want to scan the same CD twice.
If your graph runs out off the scale, then let WSES finish its task, then press ESC and choose:
Disc Measurement -> Display results:
This one allows you to show your latest scan with a different scale. Just enter your new scale and press “run test”. The CD will not be rescanned, only the graph will be rebuilt.
To give some examples: This is a graph of a good disc (Taiyo Yuden 24x).
while this is a bad burn:
If you scan a disc that has been overburned so far that the leadout has not been written completely, WSES will not be able to scan the disc till its end properly