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iMAc 21.5in HDD upgrade
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Professional Poster
Join Date: Oct 2008
Location: UKland
Status:
Offline
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Just fitted a replacement HDD for a friend into their iMac 21.5in. On these Macs Apple has started using the SMART diagnostics socket on the hd to report temp data etc so the replacement hd needs to match the type originally installed (or so I thought).
Anyway, I've replaced a Seagate Barracuda 320GB 7200 drive with a 500GB version of the same drive. However while everything work fine OS etc wise, the damn hd fan keeps ramping up to max revs.
Any ideas?
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This space for Hire! Reasonable rates. Reach an audience of literally dozens!
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Posting Junkie
Join Date: Mar 2004
Location: UK
Status:
Offline
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Service manual only contains a warning about correct installation of the sensor cable with a WD drive. My guess would be that its not installed correctly. I would open it back up and check the sensor at both ends.
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I have plenty of more important things to do, if only I could bring myself to do them....
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Professional Poster
Join Date: Oct 2008
Location: UKland
Status:
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The cables definitely in. It's hard to get it wrong, one end clips into the smart socket of the drive the other into the "temp" connector on the mobo. Have checked it twice and it's connected fine. Temperature sensor app is showing a steady temp reading off the HD but the fans keep speeding up. Strangely on the first drive SMART reporter reported the drive as failing, which it wasn't. So there's definitely an issue somewhere.
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This space for Hire! Reasonable rates. Reach an audience of literally dozens!
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Fresh-Faced Recruit
Join Date: Mar 2011
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Unfortunately you must replace the drive with an Apple OEM drive. The only way to get one of these is to take your machine to an Apple Authorized Service Center.
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Moderator Emeritus
Join Date: Apr 2001
Location: Wasilla, Alaska
Status:
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Originally Posted by MacCompuFix 
Unfortunately you must replace the drive with an Apple OEM drive. The only way to get one of these is to take your machine to an Apple Authorized Service Center.
I don't think this is true.
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Mac Elite
Join Date: Aug 2003
Status:
Offline
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I think your replacement drive is faulty.
Try another?
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Posting Junkie
Join Date: Mar 2004
Location: UK
Status:
Offline
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I wouldn't worry about SMART reporting too much unless it comes with matching strange noises or performance issues. The SMART diagnostics are not always accurate, or rather I have seen them report faults on drives which have gone on for years.
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I have plenty of more important things to do, if only I could bring myself to do them....
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