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sd0 indicates SCSI disk The channel/controller/SCSI ID address that follows is probably your boot disk; Medium error indicates a fault on the disk when trying to read a block of data at address 0x2... Unrecovered read error means the system retried to read the data &amp;&nbsp;failed again<br />
<br />
What it COULD mean is that your root disk may be about to die so do a backup NOW. This will give you an indication of how many files are affected, as you will get errors when you try to back them up. You could then try unmounting and fscking the filesystems on that disk. Rebooting should check the root filesystem. <br />
<br />
If you are getting repeated errors at different addresses and/or the errors are becoming more frequent, start thinking about replacing the disk.<br />
<br />
I don't know your hardware or Unix, so I could be wrong (I hope so!), but it's better to be safe than sorry.<br />
<br />
Good luck
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sd0 indicates SCSI disk The channel/controller/SCSI ID address that follows is probably your boot disk; Medium error indicates a fault on the disk when trying to read a block of data at address 0x2... Unrecovered read error means the system retried to read the data & failed again

What it COULD mean is that your root disk may be about to die so do a backup NOW. This will give you an indication of how many files are affected, as you will get errors when you try to back them up. You could then try unmounting and fscking the filesystems on that disk. Rebooting should check the root filesystem.

If you are getting repeated errors at different addresses and/or the errors are becoming more frequent, start thinking about replacing the disk.

I don't know your hardware or Unix, so I could be wrong (I hope so!), but it's better to be safe than sorry.

Good luck

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<br />
Any one can explain to me?<br />
<br />
/kernel: sd0(ahc0:0:0): MEDIUM ERROR info:0x25aabb asc:11,0 Unrecovered re<br />
ad error field replaceable unit: e4 sks:80,1<br />
<br />
Thanx alot
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Any one can explain to me?

/kernel: sd0(ahc0:0:0): MEDIUM ERROR info:0x25aabb asc:11,0 Unrecovered re
ad error field replaceable unit: e4 sks:80,1

Thanx alot

/kernel: sd0(ahc0........ ?

Unix is a multitasking, multi-user computer operating system originally developed in 1969 at Bell Labs. Today, it is a modern OS with many commercial flavors and licensees, including FreeBSD, Hewlett-Packard’s UX, IBM AIX and Apple Mac OS-X. Apart from its command-line interface, most UNIX variations support the standardized X Window System for GUIs, with the exception of the Mac OS, which uses a proprietary system.