11 Replies Latest reply: Oct 24, 2013 10:40 AM by BDAqua
Hisagomaru Level 1 (0 points)

It still works yesterday

but today every time i plug it in, It will either not appear at all, or say it cannot be read.


Disk utility gives me this for repair .


Verify and Repair volume “disk5s1”

** /dev/disk5s1

could not read boot block (Input/output error)

Error: Filesystem verify or repair failed.


Verifying volume “disk5s1”

** /dev/disk5s1

could not read boot block (Input/output error)

Error: Filesystem verify or repair failed.


It still works on windows.

  • Allan Jones Level 7 (33,967 points)

    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.

  • Hisagomaru Level 1 (0 points)

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


    1) eMac actually.   1.25Ghz Powerpc G4

    2) 10.5.8

    3) Usb flash drive ( PNY Lovely attache ) 2gb

  • Allan Jones Level 7 (33,967 points)

    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.

  • Hisagomaru Level 1 (0 points)

    Thanks, Im new to the forum  didn't notice they have one just for emac


    No, its not on the keyboard. Just the right side of the mac. All three of them seem to be the same.

    Um...I don't think it has any other problem. It just a bit slow, due to the age I guess.


    Also, sometimes when its plugged in, then I open disk utility, it will suddenly disappear. ( Or maybe it ejected itself )

  • Allan Jones Level 7 (33,967 points)

    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?

  • Hisagomaru Level 1 (0 points)

    The serial is G84330 then four letters


    My printer works just fine, and my psp works also. Ill get another flash drive and try it out, but I think is something about how the computer doesn't support my usb suddenly, or the usb suddenly doesn't support mac.

  • Allan Jones Level 7 (33,967 points)

    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.

  • Hisagomaru Level 1 (0 points)

    I got this from friend. He it was "his" before, so I don't think it is from a school.

    I tried it with another usb, Kingston, it works just fine.

    I think...Not 100% percent sure thou...That I had met this problem before. Maybe it's a differnt usb.

    I didn't take serious notice of it, and I was sure I didn't do anything just to fix it. I think a few days after, it works again.

  • Hisagomaru Level 1 (0 points)

    Alright my usb started to work again.

    I stick it in a macbook pro two days before, and it didn't show up at all. But when I tried it with a imac, it worked.

    i don not know what happened, but the flash drive doesn't seems to be different from before.

  • Melodie8 Level 1 (0 points)

    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?


  • BDAqua Level 10 (122,276 points)

    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.