UDF 2.50 adds the metadata partition in order to improve performance. However, encryption may become more compelling since UDF is mainly used on removable media. As device gets bigger and bigger, compression is not that important.
UDF FILE SYSTEM READER WINDOWS 7 FULL
Full disc scan before mount becomes less feasible on slow optical media with tens of gigabytes space. As the size of the media increases, crash recovery becomes more and more important.
Although it is not a problem for the current optical media, it may become a problem later. 32-bit block number limits the partition size to 2TB for 512 sector size.
Drawbacks of the current revision of UDF as of 2.60:.Even write-once media appears as a big overwritable floppy under UDF. It can be used on all kinds of optical media, including read only (CD-ROM, DVD-ROM, BD-ROM (Blu-ray Disc Read-Only)), write once (CD-R, DVD-R, DVD+R, BD-R), rewritable (CD-RW, DVD-RW, DVD+RW, DVD-RAM, CD-MRW, DVD+MRW, BD-RE), and of course block device (hard drives). It also requires platforms to preserve the information that they don't understand.
UDF FILE SYSTEM READER WINDOWS 7 HOW TO
For example, it defines how to store Mac Finder Info and Resource Fork, NTFS ACL, UNIX ACL, OS/2 EA, etc. UDF defines how different platforms interact with each other.Defect management (for media that does not manage defect internally, such as CD-RW, DVD-RW, and DVD+RW).Metadata redundancy (optional in UDF 2.50 or later in metadata partition).Long file names (maximum 254 bytes, any character can appear in the name).Extended attributes (e.g., named streams, or forks) without size limitation.Large partition size (maximum 2TB with 512B block size, or 8TB with 2KB block size).UDF natively supports many modern file systems features:.The design and evolution of UDF keeps compatibility in mind.UDF is the only file system that meets all these standards, since it was designed for the information exchange purpose. Its format should evolve in a compatible way so old media can still be accessed by new systems.Complex data structures such as B-tree are not good candidates for this purpose. This is important when this format is implemented in embedded devices (DVD player, Camcorder, Camera, etc). Its format should be as simple as possible.Some media is write once (CD-R, DVD-R, DVD+R, BD-R), some needs defect-management (CD-RW, DVD-RW, DVD+RW, BD-RE, etc), some needs to be expanded sequentially before being overwritten (most RW media). Optical media is very different from hard drives. Can support different kinds of physical media.Has rich features (preferably a super set of all common file systems) so information won't be lost when files are copied to this file system.ISO9660 is an open standard, while FAT belongs to Microsoft. FAT and ISO9660 are two formats that can be understood by most systems. This makes it possible to copy files between Windows, Mac, and Unix systems. Can be understood by different platforms.Ideally, this format should have these characteristics: It is also a good file system to replace FAT on removable media.Īny removable media (CD, DVD, flash drive, external hard drive, etc) needs a file system format. One objective of UDF is to replace the ISO9660 file system on optical media (CDs, DVDs, etc). Universal Disk Format (UDF) is a file system specification defined by OSTA.
0 kommentar(er)
