If you have a working SRX100 you can try this procedure to get a bootable USB drive (Kingston 8Gb or less are tested good for this, others may also work.)
https://kb.juniper.net/InfoCenter/index?page=content&id=KB29811
Once bootable you can then try to snapshot the internal media to get a bootable configuraiton back.
I've not seen these errors before. Hopefully someone did not do some kind of destructive bsd erase from the shell before getting rid of these devices that removed vital files or reformated the media.