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

If you can't get it to show up in Disk Utility you iMac isn't seeing it. is it USB 3.0 compatabile? If it is it will not work with Mt Lion.

I'd say try reformatting it. plug it in, and fire up Disc utility and choose the pen drive

as for compatibility, check the pack the drive came in, it should say on it for sure

John B

The OP posted that it wasn't showing up in Disk Utility. Any other ideas?

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.

Am I mistaken here, I've read a lot of posts about USB 3.0 capable Hard Drives not showing up in Finder (I know the thumb drive isn't a hard drive). I looked for specs online but didn't find any. Seems to be marketed predominantly to the Indian market.

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?

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!! 😁

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.

Glad to hear a different brand works!