I got a new hp v220w 32Gb pen drive which is not recognised by my iMac..

I just got a new hp v220w 32 Gb pen drive which is not recognised ny my iMac running OSx Mountain Lion... It does'nt show up on Disk Utility and i cannot find it anywhere even on Finder... i have checked the finder prefrences....... it is also not shown on my bootcamp windows 7 ...... But all my other pen drives work properly....... The pen drive works perfectly on other Pcs... even on my old pc running windows xp... and my friends pc running windows 7.... I really need the pen drive to work on my iMac Mid 2010.. running mountain lion.....

iMac, OS X Mountain Lion (10.8.1), U.S.B Drive Not Recognised

Posted on Aug 27, 2012 6:41 AM

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15 replies

Aug 27, 2012 8:28 AM in response to RRFS

is it USB 3.0 compatabile? If it is it will not work with Mt Lion.



Wouldn't that be a hardware (USB 3 port vs. USB 2 port) problem rather than having to do with the OS? FWIW, I will be able to check that as soon as I get my new MBP ("being readied for shipment") which has a USB 3 port.


For the OP: I checked the package specifications online and it only shows "high speed" USB which a lot of mfr's use for USB 2; I've noticed that it now usually specificcally mentions USB 3 if it is compatible with that.

Aug 27, 2012 9:25 AM in response to Trishank

I've only tried one PNY product and haven't purchased one since. I don't know if it's the lack of quality or what else it could be, but I won't recommend them.


@ RRFS: Well, it could be a Mac with a USB 2 port and the new USB 3 hard drive is not showing? I haven't seen any reports, but that doesn't necessarily mean anything - to me it would still be a logic board/firmware (?) issue since the USB ports are part of it? Just guessing here.... backward compatibility isn't necessarily 100% compatibility?

Aug 27, 2012 4:54 PM in response to babowa

That's what I am thinking. There were two threads in the last couple of weeks where the OP couldn't get the Seagate USB 3.0 to show up in Finder or Disk Utility. The other was one that would just disconnect itselfafter a minute or two. I think they both gave up and took them back for Firewire 800 docks at the recommendation of those of us who posted. Just another something to keep us on our toes, can't pull my hair out anymore cause it's all gone!! 😁

Aug 27, 2012 6:35 PM in response to RRFS

Once I get my new MBP set up and have a minute, I may plug in one of my externals with a USB cord - in this case it would be reversed: iMac has USB 3 port, external has USB 2 port - never used the USB on them since they're Quads (FW 400 + 800, USB, eSata) - worth a try maybe just to test. Just remembered: I do have one portable external, a WD USB drive - that's what I'll try it with.

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I got a new hp v220w 32Gb pen drive which is not recognised by my iMac..

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