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Steven wrote:
| On Tue, Jul 22, 2008 at 9:03 PM, Carlos E. R.
| wrote:
|
|
| The Tuesday 2008-07-22 at 19:33 -0400, Greg Freemyer wrote:
|
|
|>>>> the FAT's themselves need to be resident in memory all at once to
|>>>> maintain
|>>>> consistency? That sorta limits how big volumes might get.
|>>> Don't think so. I have not noticed our large drives being particularly
|>>> slow.
| http://en.wikipedia.org/wiki/File_allocation_table#FAT32
|
| ] Windows 2000 and Windows XP can read and write to FAT32 file
systems of ]
| any size, but the format program included in Windows 2000 and higher
] can
| only create FAT32 file systems of 32 GB or less. This limitation is ] by
| design and according to Microsoft was imposed because many tasks on ] a
| very large FAT32 file system become slow and inefficient.[12][16] ] This
| limitation can be bypassed by using third-party formatting ] utilities or
| by using the built-in FORMAT.EXE command-line ] utility.[17][18]
|
|
|
| ...
|
|>>> We still use FAT as our open standard. With big files we break them
|>>> apart via split. Re-assemble with cat.
|>>>
|>>> Our industry (Computer Forenisics) actually has lots of tools that
|>>> work with the split files since the need to so great.
| Now, I wonder why the 4 GiB file size limit. The wikipedia says:
|
| ] The maximum possible size for a file on a FAT32 volume is 4 GB minus 1 ]
| "null" byte (2321 bytes). Video applications, large databases, and ]
some
| other software easily exceed this limit. Larger files require ] another
| formatting type such as HFS+ or NTFS. Until mid-2006, those who ] run
dual
| boot systems or who move external data drives between ] computers with
| different operating systems had little choice but to ] stick with FAT32.
| Since then, full support for NTFS has become ] available in Linux and
many
| other operating systems, by installing the ] FUSE library (on Linux)
| together with the NTFS-3G driver. Data exchange ] is also possible
between
| Windows and Linux by using the Linux-native ] ext2 or ext3 file systems
| through the use of external drivers for ] Windows, such as ext2 IFS;
| however, Windows cannot boot from ext2 or ] ext3 partitions.
|
|
| But just now I can't think what's the technical reason for this limit :-?
|
| If it were a cluster count limit (per file), the size limit would vary
with
| cluster size...
|
|
| There is an exFAT format that allows 2^64 bytes per file. I didn't know of
| that filesystem.
|
| http://en.wikipedia.org/wiki/ExFAT
|
| -- Cheers,
| Carlos E. R.
| Didn't OpenSuse11 change one of the properties of ext3 so that now it
| can't be mounted under Windows using the available tools? I think it
| was 256byte inodes or something like that, I'm not an expert on
| filesystems...
| Also, are there any programs under development that will allow ext4
| access from Windows? (I realized ext4 itself is still under
| development).
Hi,
Yes, I think it's important. The default inode size in the new version
of mke2fs is 256. It could cause incompatibilities with 3rd party
file-system access softwares. It could make even grub crazy in some
circumstances, there is a bugreport what is fixed for the 11.1 installer
about grub.
If you want you can override the inode size either in command line when
you create a new FS, or in the installer. The old default size was 128.
Cheers,
Tamas
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