Often DVD files are encrypted and you cannot simply copy and paste files from them. Otherwise, it may be a faulty DVD drive that is keeping you from getting this file from the DVD.
DVD and CD share both UDF file system
DVDs primarily use the UDF file system, although it is possible to use the ISO 9660 file system as well.
UDF stands for Universal Disk Format, and it is the industry standard file system for optical media, including DVDs. UDF provides many features and benefits over the older ISO format, including greater compatibility with most DVD and CD drives or players.
It varies by the player plus the file system for DVDs gotta be UDF 1.02 or UDF1.02+ISO9660.
UDF version 2.5 file systemUDF version 2.5 File System
The Universal Disk Format (UDF) is a standardised file system for optical discs. The UDF standard was adopted by the DVD Consortium as a standard format for DVDs. Although a standard there are variations which means that not all discs can be read by all suitable machines.
UDF modifies a standard answer file by overriding values in the answer file and the identifier (id) determines which values in the UDF are used.
Some possible reasons include: 1. The computers you are trying the disc on do not have DVD drives. 2. The computers you are trying the disc do not support the type of disc you are using (DVD-R or DVD+R). 3. You are using a file system on the disc that the operating system can't read. XP, for instance, cannot read UDF 2.50 or UDF 2.60. Vista and OS X Leopard can, however.
As long as the drive is capable of reading DVDs, and the file system is one that Windows 98 understands (must be ISO9660 or UDF 1.02), Windows 98 should be able to read the disc. Note that Windows 98 cannot read UDF 1.50 or later discs, which Windows Vista and some DVD authoring programs default to.
There are medical grade DVD media---among manufacturers are Phillips.
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Most modern operating systems are not directly responsible for file management functions. Instead the operating system calls one of possibly several file management systems to provide these functions. This gives much greater flexibility and the ability to exchange files on different media (e.g. FAT, NTFS, HFS+, CD/DVD/UDF ISO-13346, Files-11).