Switch 3560 with "Trying to read a sector from block 34" error.

Unanswered Question
Oct 7th, 2008
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Dear Pros,

What could be the cause for the following error message.

Loading "flash:/c3560-advipservicesk9-mz.122-44.SE.bin"...@@@@@@@@@@@@@@@@@@@@@@


@@@@@@@@@@@@@@@@@@@@@@flashfs[0]: Trying to read a sector from block 34, with an

invalid sector number!!!

flashfs[0]: The sector number (65024) is not between 0 and 251.

flashfs[0]: filesystem marked down. Use "fsck" to recover.

Error loading "flash:/c3560-advipservicesk9-mz.122-44.SE.bin"

Interrupt within 5 seconds to abort boot process.

Boot process failed...


Thanks in advance.

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RicheeJJJ_2 Tue, 10/07/2008 - 06:01
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Right. From the output above it appears that the bootup was in the middle of loading the IOS from Flash memory and found that one of the blocks of memory is corrupt or bad. So it then kicked you into the boot prompt.

So I'd say that you have bad flash memory. You can try to put another IOS on it in hopes that it's just that one sector that's bad but this may cause problems yet again in your future. If this is a lab router then it won't be that troublesome if it unexpectedly reloads sometimes.

But if that doesn't work then I suggest installing new flash mem.

Just out of curiosity. If this router's memory filled up and it's trying to read some information past it's limit?

arumugasamy Tue, 10/07/2008 - 23:54
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I formatted the flash memory and did the xmodem.

I am getting the below error.

switch: copy xmodem: flash:

Begin the Xmodem or Xmodem-1K transfer now...

CCCCCCCCCCBB0BB0xmodem:: I/O error

How can we solve it?


joluapolo Thu, 05/06/2010 - 12:22
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You must be do the next steps:

1.-       in promt

     switch: copy xmodem: flash:c3560-ipservicesk9-mz.122-53.SE1

2.- when are you RUNNING step one, go to file transfer and add the image c3560-ipservicesk9-mz.122-53.SE1

The file image download cisco webpage

to help you look this link   look step 4


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