Viewing External Hard Drives on both PC Mac and in Parallels.

If someone could give me a clear answer on how to use an external hard drive b/w my Mac, Parallels and my work computer (PC) that would be most helpful.
I bought a external hard drive overseas and was having no problems with it on a PC but when i bought this Mac Book Pro i could only view and retrieve data and not write to it. I then partitioned it in the disk utility (master boot record) and am now unable to see the drive on a PC where all my files are, but it works perfect with the Mac.
I figured it was my dodgy hard drive from indonesia so i just bought a LaCie and i can't see it in the Parallels where i need to use a PC program even when i disconnect and connect when parallels are loaded. I haven't tried it on my work PC yet.
Is it possible to use a EHD between all 3 (Mac, Parallels and a PC)? if so how? and if not what are my options to maximizing the ability to access data on all three?
Thanks would appreciate any insight.
Mac Book Pro   Mac OS X (10.4.9)  

Hi and welcome to Discussions,
the reason why your MBP could not write to the HD was, because it was most likely formated using NTFS as file system, which OSX can read from, but not write to.
The best file system for all three is FAT32, which is read- and writeable for all three.
Two problems with FAT32:
1. single files can not be bigger in size as 4GB
2. Windows can not format partitions with FAT32, that are bigger than 32GB.
The first limitation can not be overcome with FAT32.
The second can be overcome, when using Disc Utility from OSX with MBR as partititon scheme and MS-DOS (OSX name for FAT) as file system.
Or you can use command-line program to do this with your PC: http://www.heise.de/software/download/h2format/40825
(Sorry, link is in german).
That way all three should be able to see and use the external HD.
Although it is a fact that Parallels can be picky sometimes with USB-connected drives, but with the newer versions of it, this problem has become less evident.
And since up to now Parallels does not support FireWire, you must USB with it.
Regards
Stefan

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