RD54 Stopped Spinning

Jon Elson elson at pico-systems.com
Sat Apr 4 11:29:19 CDT 2015

On 04/04/2015 12:41 AM, Robert Jarratt wrote:
> Hmm... does that mean it might be difficult to reach/see/replace the hall effect sensors?
On the older drives with external motors, the Hall sensors 
would usually be on a ring-shaped PC board against the drive 
housing.  So, you'd have the pull the external magnet 
assembly off the motor, change the sensor and reassemble.
A very difficult job, but technically feasible at least on 
some drives.  If the motor is entirely internal, it is 
unlikely you can do this.  You would have to safely back the 
heads off the platters, then remove the clamp and remove all 
the platters and spacers off the motor.  Then, you'd have to 
press the platter hub/motor magnet assembly off the shaft, 
replace the sensor and get it all back together again, and 
get all the platters back correctly.  The CIA might be 
willing to do this to recover Osama bin Laden's files, but 
seems WAY out of the realm for doing it at home.

I've disassembled a number of hard drives over the years, so 
i know a bit about how the motors are constructed.


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