My usb stopped working. It say it cannot be read. While it works yesterday, and still works on pc

Please help us help you by telling us more informarion:

1) your iMac Model (processor type is a good start)

2) your Mac OS version

3) What type of "USB? A printer? a hard drive? a thumb drive? an iDevice? A keyboard? Posting "USB" alone leaves us guessing at your meaning.

If the problem is related to an external hard drive, plesae post its make and model so we can look up the specifications.

Actually...I post this in the wrong place..sorry

iMac, eMac. They sound similar in every language but English! I'll get the Hosts to move this to the eMac section so you don't have to repost.

The good news is we have two eMacs in the family: one the first generation; one the last.

When you get the messages, what ports are you using? It is fairly normal for a flash drive to fail when plugged into a port on the keyboard (low-powered port). If you used a port on the right side of the eMac case, then it should work.

Have you experienced any other odd symptoms with the computer? Unexpected freezes, video defects, or no video, etc? I ask because a fair number of 1.25Ghz eMacs had near-fatal logic board problems. As odd as the symptoms of the logic board problems seemed to be, it would no longer surprise me if it affected USB. If you are seeing other problems than this, I can post a list of serial numbers that Apple said contains the affected computers.

Well, let us check to see if your eMac falls among the affected units.

First you need the serial number. Easiest way:

How to locate the serial number and identify your model

Important: do not post your full serial number here.

See if it falls within these ranges:

• G8412xxxxxx- G8520xxxxxx
• YM412xxxxxx - YM520xxxxxx
• VM440xxxxxx - VM516xxxxxx

Being within one of those ranges doesn't absolutely mean yours has failed. You don't have the classic symptoms. Still, it's something we should consider "just in case."

Another thing: does ANY other USB device work properly when attached to those ports? Printer; other drives, etc?

You are in one of the affected ranges but so far, I'm not hearing any symptoms of logic board trouble. Are you the original owner or did you buy the eMac used?

Some affected eMacs were owned by schools who exercised the Rpeair Extension option (now expired) so there are machines in the affected ranges that have been retrofitted with reliable components.

Trying another flash drive is a good idea, as it seems the ports work for other devices.

I have the same issue. I can read my usb kingston drive on a PC but not on a macbook air and neither on my friend's imac... I waited and tried it 3 days later... still nothing. Can anyone help?

Thx

Hello, you might get more help posting a new topic of your own in MacBook forum or your particular OSX version forum. 🙂

Do you know what format they are? Do they show up in Disk Utility at all?

If you post elsewhere & include that info, please copy a link here.