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drivers - How to mount read-write an ext4 partition on Windows?



I want to use ext4 on my external HDD, but it must be cross-platform. (At least Linux, Win7 & WinXP).


Unfortunately, I haven't found any proper driver allowing Windows to WRITE to ext4. I've found Ext2Fsd, but it only reads ext4.



9. ext4 extent read-only, no size truncating and expanding support



More:



Supported Ext3/4 features:



  • flexible inode size: > 128 bytes, up to block size

  • dir_index: htree directory index

  • filetype: extra file mode in dentry

  • large_file: > 4G files supported

  • sparse_super: super block backup in group descriptor

  • uninit_bg: fast fsck and group checksum

  • extent: reading, writing with no extending.

  • journal: only support replay for internal journal


Unsupported Ext3/4 features:



  • journal: log-based operations, external journal

  • extent: size truncating & expanding, file deletion

  • flex_bg: first metadata group

  • EA (extended attributes), ACL support



Also, I have found a patch for Ext4Fsd v0.50 (here):



New: Matt Wu has made a new release 0.50 at ext2fsd.com. Ext2fsd-0.48-bb8-signed Support for ext4 extents and fix for BSOD on Windows 7.



I don't think it will be safe. Also I've read some words about writing ext4 in Windows could cause data loss on the disk...


What is the External HDD used for? - First, it will store backups, then family movies, pictures. Some music, and etc. It will be connected to a Raspberry Pi, if I finally receive it. It won't really move, just when it is used to migrate computer's data to a new one. The largest files it will store are Clonezilla disk images (I don't know, if they will be large files or not).


Can someone provide a solution for this problem? Or is there NO important enough difference between ext4 and ext3, and I should use ext3? - (If yes, then can I use Ext2Fsd for that ext3 mount?)


Thank you!



Answer



I would use NTFS instead. It can easily be read/written to by Linux, Windows and OS X (among others).


Considering the intended use and the fact that it is an external drive, I see no reason why you should go through the hassle that using ext4 will be.


If this were your primary hard drive, perhaps the advantages of ext4 (briefly, less drive fragmentation and slightly improved performance, for more information see here) would be worthwhile. I doubt you will even notice a difference on an external USB drive. The bottleneck will be the rate of data transfer over the USB cable.


For most users, the only obvious benefit of ext4 over NTFS is that ext4 allows file names with special characters (? & % etc). Such file names, however, are both a bad idea and of no particular interest to you.



EDIT: In answer to B. Roland's question about defragmenting, yes, there are two ways I know of to defragment an NTFS drive under linux. One is an open source tool called shake. I haven't used it but it seems to work. The other is simply copying all data from the external drive, deleting everything from the drive and then copying everything back. Finally, since your drive will also be accessed under windows you can use the windows defragmenter.


I think, however, that you are attaching way too much importance to drive defragmentation. Have a look here for a simple explanation of fragmentation. Briefly, a fragmented drive is one where the files on the drive are not stored in contiguous blocks but spread out across the drive. This is usually caused by changing a file's size after it has been written. So, say you save a 1 MB file on your drive. You then modify the file and its size goes up to 20 MB. If there is not enough free space at the position where the file was created, this extra data will be written to a different part of the hard drive. In other words, the file will be fragmented.


This kind of thing is not likely to occur very often in a drive used for storing "backups, then family movies, pictures. Some music, and etc". Most of these files will never change in size, and therefore, will never fragment the drive.


In addition, even if your drive is fragmented, you don't really care. Fragmentation can be a problem for system drives where you can have many I/O operations per second. In those cases you can notice a decrease in drive performance. As I said before, on an external drive I don't think you will be able to detect this, even if it does happen.


So, in conclusion, you almost certainly will not need to defragment an NTFS formatted external HDD. However, if you really want to, you can do it both in Linux and in Windows.


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