Transfer data from mac to external hard drive

I am new to macs and am a bit lost.
I have a made up external hard drive (internal hard drive in a case) - TOSHIBA MK8025GAS Media. It is connected to the mac via USB.
I have been using it to transfer data from my pc to mac. The mac sees it and i can copy things from the hard drive to mac without problems. What i cannot do is to transfer from the mac onto the hard drive.
I pulled up the mac info of the hard drive and its both writable and ejectable (Has two partitions). In the partitions the info states that the owners aren't enabled, cannot turn owners off and cannot be formatted. Also the S.M.A.R.T. status is not supported. Not usre what all this means!
Can anyone tell me how to set it up to be able to transfer files to the hard drive from the mac and if it is possible to still transfer from windows to the hard drive?
Thank you in advance.

Thank you for the info.
A friend also told me that i could erase the hard drive using the disk utility in ms dos format. I have tried this and then could also partition it afterwards.
At the moment this seems to be working in both Mac and PC.
One thing i have noticed is when i try to transfer disk images (over 4Gb), near the end i get an 'unexpected error occured' (error code 1309).
From the internet:
error -1309 fileBoundsErr: file's EOF offset mark or size is too big
Whatever this means?

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http://answers.microsoft.com/en-us/windows/forum/windows_7-files/how-can-i-forma t-external-drive-in-exfat-not-in/0f6bf19a-19d6-4470-ae05-53ddf26bb476?msgId=1860 eae3-3488-4eea-8326-f87b89d9851b
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Transfer data from mac to external hard drive

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