I am having a strange problem with some external hard drives. The drives are fine it's just that I cannot connect them to the computer all at the same time?? I am using Ubuntu 13.04 64bit on a thinkpad laptop. I am trying to connect a 500gig WD SATA hard drive, a 120gig SATA WD hard drive and a 250gig IDE WD hard drive all external. I thought it might be an IDE, SATA thing causing the problem but I can connect the 500gig SATA and the 250gig IDE and there is no problem but when I try to connect the third 120gig hard drive the little lite on the drive just pulses and does not connect?? When I disconnect one of the other drives and re-connect the 3rd drive it connects no problem?? This happens with any combination I try and all ends with the same result, cannot connect a third external hard drive?? I have had this issue for a long time. I had the issue with Ubuntu 12.10 and 12.04 as well but can't recall if other Ubuntu's had the issue or not?? Am I missing something here?? Is there something I need to add to fstab or other place?? They all automount whenever I connect them seperately?? Any ideas, this is strange to me?? Thanks in advance for any help and pointers.