Hello.
I can confirm that we have exactly the same issue.
This is on ours HP Elitebook 8560P notebooks, we have been using Intel SSD 320 without issues before.
But with the 530 when restarting no disk is found, cold boot works.
Using latest BIOS, firmware etc.
Its is hard for me to believe it is a HP issue, i'm leaning towards SSD firmware issue.
Best Regards
Anders