Re: 4100 problem - HDD bad?
You can't recover from a RAID 0, so everythig will be lost unless you use a recovery service. You can not expand a Raid5 on a snap, you can add a spare. But you will only be using 1/2 the capacity that way. Depending on the age of the drive I would be tempting to replace all if over 5 yrs. Try to get drive that are server rated for RAID, they have a min seek time. Snaps can be picky when it comes to seek times. But I think the smallest WD makes is 160gig, and the last tiem I bought drives the 250gig were cheaper ($71). But they were going into 4500 with plenty of power. Installing 250gig is a 4100 is a lot of extra power for spinning up the second platter, I would stick with 160's. I did test the 250's in my 4100 and had no problem with them. If you happen to power down and it does not spin back up, I would cool the drive off in the freezer for an hour in a ziploc bag to keep it dry. Sometimes it will kick start them.
Good luck.
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