![]() ![]() Supports large files, UNIX permissions, Unicode filenames, symlinks, hardlinks, etc.Can be used read-only in Windows XP, and be used after a command line mount in Linux 2.6.0+.Mounts automatically read-write in Linux 2.6.30+, Mac OS X 10.5+, Windows Vista+.Some testing shows that this really works on Linux, Windows and Mac OS X: The nice thing is that UDF does not (I suppose deliberately) use the first few kilobytes of the partition or disk it is placed on, so this place can really be used to store a legacy partition table, referring to a partition that spans the whole disk. Partition editor programs seem to refuse to create such a table, but at least recent Linux and Windows kernels don’t seem to bother. However, it seems possible to construct a partition table whose first partition starts at sector 0, so the result is a partition which contains the partition table itself. Typically, the first partition specified will start some kilobytes further. ![]() This master boot record is stored in the first sector on disk, sector 0. Rather surprisingly, there is a solution which works for both: having the disk partitioned and unpartitioned at the same time.ĭOS partition tables are stored in bytes 446-510 of the master boot record. On the other side, UDF only works in OS X when it is used on a full disk (unpartitioned). Mac OS X 10.5 supports UDF fully up to UDF 2.01, but only when used on a full disk, so not partitioned.Īs explained above, for USB harddisks, Windows requires the disk to be partitioned. Linux 2.6.30 and up supports UDF fully at least up to version 2.5. Windows 7 have full support up to UDF v2.6, but the UDF block size must match the block size of the underlying device (which for USB-sticks and most disks is 512 bytes "advanced format" disks are 4096 bytes). Here are his findings (used to be there, now offline): Someone did some research into how to format a flash drive with udf so it can be used on as many operating systems as possible. ![]()
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