External Hard Drive Not Mounting

[graemesangels]

Hi,

I was planning on switching out my Macbooks hard drive with a larger one. I tested the external drive out initially and it was working fine. I then took it out of the case and when I tried to mount it again it said that it had not been disconnected properly and then disappeared and I can't get it to come back.

Any ideas what might be wrong with it and/or how to fix it?

thanks.

 

[EricNau]

Is it visible in Disk Utility (found in your Utilities folder)?

 

[graemesangels]

No, it's not showing up there or anywhere else.

 

[graemesangels]

I just tried plugging it in to a windows computer and the computer seems to recognize that an external hard drive was plugged in but the hard drive never shows up in my computer. Under device manager it says the drive is working fine but I still can't seem to access it.

 

[Consultant]

Windows will not see OSX formatted drive without something like MacDrive.

Does the drive spin up or make clicking noises?

One thing that MIGHT work is Disk Warrior.

 

[graemesangels]

Thanks for your suggestion Consultant. I looked up the software you suggested and it costed more than the hard drive I bought so I decided to pass on it. I did however find the solution to my problem after a little more searching.

I don't understand why what I did worked but it did. I wiped(?) the PRAM be restarting the computer and holding command-option-p-r or something like that and voila, the drive mounted no problem.

Thanks again for your help.