External harddrive not recognised preferences are set up good

HI can someone please help me ??
I have an MAcbook pro:
Processor  2,6 GHz Intel Core i7
Memory  8 GB 1600 MHz DDR3
Graphics  Intel HD Graphics 4000
Software  OS X 10.9.3 (13D65)
I have an external hardrive and I could always move, change files too it. But as of today it wont show up anywhere. Not in the sidbar and not on my desktop.
All finder preferences are set up well. The harddrive does show up on my moms computer (windows, ugh) An small usb stick does show up, it also recognises my Canon5d mark II. But the hardrive will not appear. PLEase help me...im getting frustrated as i cant make this work. Im abroad frm my own country and really have to make this work as i store my photo's to my drive..... I dont have an 2nd hardrive as my mac and this hardrive are at my holiday adress the redundancy.
I hope you know what software i have....as i just copy past this from my info (aboutthis mac) not sure mavericks or mountain lion
Thanks in advance much appreciated 

HI sorry thats what I ment. The disk utility(application) in the folder utilities. The strange thing is that Yesterday the hard drive did apear there. I thought maybe it has something to do with NTFS application. As before I had installed this I could only read but notwrite to files on the hard disks. So I uninstalled and reinstalled the software,,,,,now the hard disk does not appear anymore in disk utilities .....I'm getting futher away from an solution .... :-( what can this be ? ever heard of an problem like this ?  I thank you in advance for taking your time to look into this problem.
Regards,
Terrence
see both screeshot. Only the usb stick appears. and see preferences also

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