My laptop fails to read a seagate external HDD

Hello!
I recently tried to use a Seagate external HDD with my laptop and although the installation was successful, a message appears saying: "Location is not available. H:/ is not accessible. Access is denied."
The HDD is installed properly (the driver is shown in Drivers List) and its status on Disk Management appears to be online.
I tried the HDD in an other Computer and in a TV and it works perfectly.
I had the same problem with another Seagate external HDD a few days ago, but back then I thought I was circumstantial.
Is there anything I can do?
Thanks in advance!

Unfortunately, Mavericks is having plenty of issues with Time Machine.
If your Mac is backing up OK to the Time Capsule, try resetting Time Machine Preferences / Options by adding the external hard drive back onto to the list of Excluded items, then saving the changes, and then closing the preferences window.
Wait a minute and then open up Time Machine Preferences / Options once more and them remove the drive again from the list of Excluded items.....which tells Time Machine to back it up, and then Save the changes.
We're trying to avoid having to delete the Time Machine Preferences file here, since doing that will force you to set up Time Machine all over again......but it may be necessary.

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I've spent 2 hours trawling through blogs/mac forums/apple support and nearly bought Disk Warrior out of frustration, but surely there must be a simpler solution?
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Any help greatly appreciated, even if it is to pay the $$$ for DW...!
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I am new MAC user recently converted from PC. I have a Macbook Air 2013 and the new time capsule 2013 as well.
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Finally, I have read stuff about how the HDD is formatted. Could it be the reason?
I need some help please!
It surely is at least a major factor.. maybe several are involved.
You cannot see a disk formatted NTFS.. ie standard windows format from TC.
The disk must be plugged into the Mac and open disk utility..
You need to change the partition over to GUID from MBR.. and change the format to Mac OS extended Journaled.. or HFS+
Although FAT32 is also supposed to work.. that will lead to other issues.. don't do it.
If you format a drive with data on it.. your data is gone.. just to make sure you know that.
You can plug the drive into the computer and copy the data to another location.. and then format the drive.. and copy it back.. if you have an air without the Thunderbolt to Ethernet adapter this will take aprox 1month to achieve.

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Following are details that may be important:
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Ken Stone's article: http://www.kenstone.net/fcphomepage/partitioningtiger.html
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My laptop fails to read a seagate external HDD

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