Identify a broken component
That is a piezoelectric ceramic shock sensor / acceleration sensor, likely made by muRata. I've seen up to 3 of them strategically located on hard drive boards. They are labeled as &quot;SK&quot; on WD PCBs, but aren't labeled on Maxtor HDs. Here are links for info and 2 datasheets:
https://www.murata.com/en-us/products/productdetail?partno=PKGS-00GXP1-R
https://www.murata.com/en-us/products/productdata/8797617225758/00GXP1-E.pdf?1452655830000
http://www1.futureelectronics.com/doc/MURATA/PKGS-00LD-R.pdf