I have an 2008 iMac that I brought out of storage. It had not bee heavily used and sat in storage for a couple of years. I installed 10.11 on it and it ran fine for a week or so. Then it froze up and wouldn't reboot. The fchk routine failed. I booted it with my TTP flash drive. The repair function in Disk Utility failed. Volume rebuild in TTP failed. So I am doing a disk scan. It is a 250 gig disk and has 488,000,000 blocks. After 14 hours, it has scanned about 178,000,000 and has found over 2000 bad blocks so far. I noticed that they tend to come in groups with the first big bunch around 545,000, then another big bunch at 1,200,000, etc. If the current rate holds, it will find around 5000 bad blocks. Is that a reasonable amount or is that an indication that the drive is failing?
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