I have a question concerning my portable drive
When I connect it to a XP machine here in the office –I can only see the 300+MB part of the drive, I have installed the software for the drive and verified I have the right drivers installed for the hard drive.  Should I be able to see the larger partition on the drive if it was created on the MAC I run @ his home?   Right now I cannot
 
Thanks
 
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Since this drive is used for a backup program on the mac called "time machine" the Mac requires it to be formatted for the Mac.  It's a file type you will not be able to access on your windows machines.  While macs can read windows formatted drives like NTFS and FAT32, Windows can not read Mac formatted drives.  Unless you use a third party software like Mediafour | MacDrive. You could also network the drive via file sharing (requires 2 computers or airport extreme with USB port).