Can anyone explain to me what Linux doesn't use NTFS be default?

Apart from it being a crap filesystem? Or do you mean why isn't full support added by default? Probably because lots of people don't want/need it, and having the drivers in userspace speeds up development considerably.

You may find this thread interesting http://www.linuxquestions.org/questi...-thing-685032/

it was a question for a homework assignment and I was curious just why doesn't linux use NTFS besides the fact that it is a crap filesystem.

Being crap is a pretty good reason

I would assume Microsoft have it patented/copyrighted/whatever you do for file systems

NTFS came out in the early 90's, so Linux was already underway.

NTFS doesn't support any of the unix style permissions that Linux uses.

It fragments badly.

I'm sure others will add more.

You should learn about the filesystems that Linux uses. Besides the basic ownership & permissions, they also support extended attributes such as immutable , ACLs, quotas and security features that selinux and others use.

Why would a foreign filesystem be used by default? It is like asking, why French people don't speak Japanese all the time.

It isn't "crap filesystem". The problem is that current implementation of ntfs on linux doesn't support all features that available, say, in ext3. There is no device nodes on NTFS, access unix rights aren't implemented on NTFS (and won't be, I think), linux users/groups aren't supported, not all features of ntfs are accessible on linux, etc.

In my space, anything that forces me to defragment qualifies that as crap I'm afraid. Matter of viewpoint.

NTFS is a very robust and reasonably fast filesystem. The need to defrag is a significant downside, but beyond that NTFS is a very solid filesystem.

It also is Microsoft Proprietary, and was only made available in Linux at all after a substantial reverse-engineering effort by Linux developers.

To my experience, NTFS is very difficult to kill, and it doesn't require disk test in case of power failure or after 30 mounts. As for defragmenting it - it doesn't force you to do it.

This is actually a weakness. Any filesystem can become corrupted, and Linux runs a check of the filesystem every 30 mounts just to make sure that it isn't corrupted, or if it is, the corruption is caught and fixed before it propagates and causes crashes or data loss.

Windows doesn't do this, presumably because it takes time and Microsoft is not interested in educating users. The consequence is that probably the majority of NTFS filesystems out there ARE corrupted and DO cause intermittent and spurious problems.

Windows only runs chkdsk when Windows itself cannot start. The wise and experienced user runs chkdsk periodically anyway.

Here, in detail, is what I have to say about it:
http://www.softwareforlandlords.com/compMaint2.php

Homework....

Why ask homework questions here anyway... Isn't the point in answering a question to learn things that may not be discovered otherwise?

Sometimes it's not simply a matter of answering the question correctly but what you learned about the subject trying to answer it.

NTFS - New Technology File System - developed by microsoft. Designed for Window's needs not Unix. Windows is not Posix based as such, the file permissions are completely different. For Linux (or any operating system for that matter) to be some what secure, it needs file permissions. The way linux file systems stores this information is completely different that windows.

I would start your search there.

there are likely better answers and if you really want to know the teacher's socks off, you would have tons to say about file systems in general including journals and reliability checks.

Kinda like making a cheat sheet for an exam. I found out that all the time I spent making one, I never needed it for the actual exam.