Microsoft NTFS, short for NT File System, is the default file system for most storage devices used on Windows PC. The OEM string is at offset 0x03 to 0x0A in the VBR.ĮDIT: Tested all this in Tuxera NTFS 2010.Posted to Troubleshooting Tips by William on | Approved by Jennifer Allen The correct way of detecting an NTFS partiton (volume) is by it's OEM string after the Jump/Nop instructions. I want my data partitions out of this menu without the boot code signature (0xAA55) but detectable/mountable by NTFS for Mac! To a boot manager all partitions with this signature could be bootable (and show in, for example, a multi-boot menu) and this isn't always the case. Why I'm saying this? Because having the 0xAA55 signature in all partitions (volumes) confuses some boot managers (example rEFIt). I tested it myself and Windows detects perfectly an NTFS partition without this signature (Mac OS X without NTFS for Mac does it too). Theres a KB article about this at Microsoft.
Microsoft says that this signature is only needed when a partition (volume) has bootable code. It's using the "magic number" 0xAA55 on the VBR (Volume Boot Record). There's a third problem, about the way NTFS for Mac detects when a volume is an NTFS volume.
You can see that also in the Disk Utility app and my volume is NOT compressed!
It says " Windows NT Filesystem (compressed)". Check again the "diskutil info" output, now at the name of the filesystem. This works with any other volume, and with this same volume "Windows" with NTFS for Mac disabled!Īlso there's another anomaly in the way NTFS for Mac detects the volumes. Worst, if you try, you can't even unmount the volume at Terminal with a simple command like this: So you can't prevent the mounting of a volume with the fstab file, because the label is corrupted/wrong! What is that garbage after the real name? If I disable NTFS for Mac, the volume label appears correctly (and I mean even "escaped with Unicode"). Take a look at the volume label "escaped with Unicode": Windows%FF%FE%00%00 Code: bash-3.2# diskutil info /dev/disk0s2Įscaped with Unicode: Windows%FF%FE%00%00
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