To mount the drive automatically, it's expecting to see a FAT32 partition.  Lowest common denominator and all that.  

The Apple machine may also mount the drive automatically if it's formatted with HFS or HFS+, but I haven't tried that.

It's probably entirely possible to mount an NTFS formatted flash drive, if the driver is installed and the teacher knows how to do that.

---- AZ Pete <plug@cactusfamily.com> wrote: 
> Hi All,
> 
> I'm not an Apple guy so I thought I might ping fellow Pluggers who may be familiar with Mac OS.
> 
> My son needed to provide a USB flash drive to his science teacher so the teacher could copy several videos to the drive. The teacher who uses an an Apple (don't know make/model) returned the drive as "unreadable" when I know the device works fine. I gave him another one and things worked ok. After the fact, I noticed that the "bad" flash drive was formatted NTFS, while the one that worked was formatted FAT32.
> 
> Can Apple OS read a USB flash drive if it is formatted with Windows NTFS filesystem? Or must it be formatted FAT32?
> 
> Thanks,
> Peter
> 
> 
> 

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