The original was an old Intel X-25M SSD. The replacement was a Crucial M4.
The x220 takes 7mm form-factor SSDs. So I removed the plastic spacer.
When I booted the machine, I only got blank screen. I heard a faint clicking noise, as if the fan was repeatedly attempting to spin up. However the noise seemed to eminate from the right side of the machine where the drive was. I do understand the idea of an SSD clicking is nonsensical.
I did have a usb stick connected at the time. So I did the usual process of elimination. With usb stick / without ssd etc. Can't remeber the exact order and results, but I attempted several boots with the SSD.
Now the machine no longer boots, even with no drives. No post beep, no bios splashscreen. Nada.
I get the feeling, by removing the spacer on the Crucial SSD, I created a short circuit and blew something on the mainboard. When I removed the spacer and reassembled the SSD the top plate was of by 1mm so may have bridged some contacts.
Something that lends credence to this theory is when I comapred the old intel SSD to the Crucial. I also removed the spacer on the Intel SSD, however the Intel has a plastic backing where the discrete SMD components are. I guessing this is where the power components are too, thus protecting them.
Funnily enough the Crucial SSD still works fine in another machine.
Have I burnt something out on the mainboard?
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There's a blog post about modifying the M4 to fit 7mm drive bays and it explicitly mentions insulating the circuit board.
Backup: X601 Core 2 Duo T8100
Toy: X60F Core Solo U1300
On loan: X220 4291-P79 i5-2520M
In pieces: two retired but working X61Ts
RIP: 760XD 9546-U9E; X61 7676-A24; and a BOE-Hydis HV121P01-100 in failed SXGA+ mod
Honestly this is a poor effort from Crucial. If you give end users the option of taking the drive down to 7mm, at least provide the minimum insulation.
It's just a layer of plastic. It's a miniscule cost compared to the SSD itself.
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