| Author |
Message |
jrguy8
Joined: 06 Apr 2008
Posts: 34
Helped: 2
|
 07 Apr 2008 10:28 ipod usb problem |
|
|
|
i have a third gen ipod. i accidentally disconnected it from the pc usb, but it still shows on the screen "do not disconnect". now my pc doesn't recognized the ipod and it shows "USB device not recognized"..
does somebody know how to fix this?
thanks.
|
|
| Back to top |
|
 |
banjo
Joined: 24 Dec 2005
Posts: 455
Helped: 86
|
| 16 Apr 2008 14:14 ipod usb problem |
|
|
|
Take a look at this link:
http://forums.ipodhacks.com/archive/index.php/t-1149.html
According to this web site. You hold down the menu and center buttons for 8 seconds. Apparently, this then does some sort of soft reset.
|
|
| Back to top |
|
|
jrguy8
Joined: 06 Apr 2008
Posts: 34
Helped: 2
|
| 22 Apr 2008 14:45 Re: ipod usb problem |
|
|
|
| thanks. but it doesn't work.
|
|
| Back to top |
|
|
jrguy8
Joined: 06 Apr 2008
Posts: 34
Helped: 2
|
| 07 May 2008 0:13 ipod usb problem |
|
|
|
| please help. my ipod is a third gen and it uses CY7C68013-56LFC a microcontroller for its USB I/O. i hope i just have to replace supporting components not that USB controller chip.
|
|
| Back to top |
|
|
banjo
Joined: 24 Dec 2005
Posts: 455
Helped: 86
|
| 07 May 2008 1:15 ipod usb problem |
|
|
|
Did you see the following?
http://docs.info.apple.com/article.html?artnum=61711
To be honest, I do not own an i-Pod myself. Therefore, I cannot only give general advice. However, until someone more knowledgeable responds:
1. Fully Charge the Unit.
2. Go to another computer that has never had the i-Pod installed and connect it via USB. If the computer recognizes it and starts asking for drivers, then the problem is the software installed on the original PC and not the i-Pod.
3. If the other computer also fails to recognize it, try another cable. It is possible that your cable is bad.
4. Try this i-pod hard reset:
http://www.activewin.com/tips/tips/apple/ipod/7.shtml
5. Call or e-mail Apple about the problem.
Note: USB is supposed to be a hot plug interface. Plugging or unplugging the device during operation is not supposed to damage the hardware. It the device is in the middle of an operation, a hot plug can corrupt data which is what I believe has happened.
Good Luck.
--- Steve
|
|
| Back to top |
|
|
jrguy8
Joined: 06 Apr 2008
Posts: 34
Helped: 2
|
| 07 May 2008 11:40 ipod usb problem |
|
|
|
| thanks. i'll try it.
|
|
| Back to top |
|
|
jrguy8
Joined: 06 Apr 2008
Posts: 34
Helped: 2
|
| 10 May 2008 0:01 Re: ipod usb problem |
|
|
|
| banjo wrote: |
Note: USB is supposed to be a hot plug interface. Plugging or unplugging the device during operation is not supposed to damage the hardware. It the device is in the middle of an operation, a hot plug can corrupt data which is what I believe has happened.
Good Luck.
--- Steve |
is it possible that the rom data in the usb microcontroller be corrupted also?
|
|
| Back to top |
|
|
CMOS
Joined: 06 Jan 2004
Posts: 658
Helped: 22
|
| 10 May 2008 0:29 Re: ipod usb problem |
|
|
|
| jrguy8 wrote: |
| banjo wrote: |
Note: USB is supposed to be a hot plug interface. Plugging or unplugging the device during operation is not supposed to damage the hardware. It the device is in the middle of an operation, a hot plug can corrupt data which is what I believe has happened.
Good Luck.
--- Steve |
is it possible that the rom data in the usb microcontroller be corrupted also? |
CY7C68013 does not have internal ROM ... All the code is copied from external I2C EEPROM into its internal RAM at power-up and then executed from RAM. And I2C EEPROM is write-protected using WP pin in most case. So I don't think its corrupted.
|
|
| Back to top |
|
|
jrguy8
Joined: 06 Apr 2008
Posts: 34
Helped: 2
|
| 12 May 2008 8:55 Re: ipod usb problem |
|
|
|
| banjo wrote: |
Note: USB is supposed to be a hot plug interface. Plugging or unplugging the device during operation is not supposed to damage the hardware. It the device is in the middle of an operation, a hot plug can corrupt data which is what I believe has happened.
Good Luck.
--- Steve |
but why mp3 players and flash drives got busted when unplugged without safely removing it from windows?
|
|
| Back to top |
|
|
banjo
Joined: 24 Dec 2005
Posts: 455
Helped: 86
|
| 12 May 2008 14:53 ipod usb problem |
|
|
|
The file allocation table, FAT, is a linked list. It is always stored on the hard drive or flash drive depending on the player. When copying data to the i-Pod or other mp3 player, the OS has to write new data to the FAT. If it is interrupted during this write, the FAT table is corrupted and the linked list is broken.
Typically, this is fatal to the firmware of the player and either a hard reset or reformatting the storage space is required. I had a player with a removeable flash card that this happened to frequently. The player put some special data into the FAT table. If I reformatted the card in a card reader or other device, the MP3 player would not recognize it. I had to format it with the player to make it work.
Because of the fragile nature of the FAT table, that is why Windows has all those warnings about turning off a USB device before unplugging it. Turning it off in Windows only insures that all writes to the device are completed and no application has open files on the device. It does nothing to actually turn off the hardware, it just insures that the hardware is idle before disconnecting.
---- Steve
|
|
| Back to top |
|
|
