I got the have install a SATA HardDisk on the machine recently. But somethings the Disk cannot be accessed. And mesg tells that it is IO error. Is it a hardware problem or system setting problem. Here is the message from dmesg. sd 0:0:0:0: SCSI error: return code = 0x00040000 > end_request: I/O error, dev sda, sector 27099199 > EXT3-fs error (device sda1): ext3_readdir: directory #1687553 contains a > hole at offset 0 > Thank you. Regards, Ming -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.centos.org/pipermail/centos/attachments/20070829/830a6ff4/attachment-0005.html>