Unable to mkfs.ext4 - in use by system

Hi,
I created 3 logical partitions on my laptop using cfdisk and booted the arch dual installer using a usb drive. I then try to
mkfs.ext4 /dev/sda6
which is my / partition and I get the following message
/dev/sda6 is apparently in use by the system; will not make a filesystem here!
Since I booted via USB I don't see how this could be true. Any help would be great! Also I did search but couldn't find anything. This is going to be a dual boot system with windows 7.
Update: I created partitions with both cfdisk and fdisk and it made no difference. Still unable to mkfs.ext4 and even mkswap
Thanks!
Last edited by sinisterz (2012-09-25 00:10:46)

Did you make sure the partition was NOT mounted before running the command? Also you could try using GParted (various Live CDs available) for creating partitions and formatting.
Last edited by anonymous_user (2012-09-25 00:22:24)

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The folder C:\j2sdk1.4.2_13\jre\lib\security contains the Java Cryptography Extension (JCE) files - 'local_policy.jar' and 'US_export_policy.jar' .The default files will have a size of 3 kb.These need to be replaced by JCE Unlimited Strength Jurisdiction Policy Files - 'local_policy.jar' and 'US_export_policy.jar' which are of size 5kb. In brief, C:\j2sdk1.4.2_13\jre\lib\security should contain the files - 'local_policy.jar' and 'US_export_policy.jar' and their size should be 5kb (and not 3kb). After we did this change the decrypt worked fine.

[Fubar] Oh boy, did mkfs.ext4 on an already installed to partition

Long story quickly, I did mkfs.ext4 on an already ext4 partition. I was kinda casual about it because I made a backup before I did this, but now it turns up my backup is bad (not sure how that happened) and will only extract about half the files before erroring out. Not a huge deal as I did a full backup five days ago, but a few things back would be nice. I've looked around and haven't been able to find anything. Has anyone come across a way to be able to reconstruct the files that are on there?
Last edited by Gen2ly (2010-04-01 06:49:07)

Gen2ly wrote:but now it turns up my backup is bad (not sure how that happened) and will only extract about half the files before erroring out.
Do you know this because you were trying to restore to the partition in question? Or is that partition still clean (freshly mkfs'd)?
If the latter, then yeah, I've in the past fully recovered from a mistaken reformat. I don't remember any more what utility I used (nor whether it was a Mac or a Linux utility), but as to possibility, this is certainly possible. Once you start writing to the partition in question though, I think in practical terms you can forget it. Individual files that haven't been written to will still be recoverable, but when I've had to do *that* in the past everything I could get back came back flat (no dir structure, I think even filenames were lost). So though there was a lot of raw data recovered, it was practically too hard to sift through it, I just gave up. If at all possible, you want to recover the old filesystem.

Unable to mkfs.ext4 - in use by system

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