A:AnswerNo on/off switch, when you shut down your computer, PS4, Xbox, etc properly the drive shuts down with it. If you shut off your attached device improperly, the drive has an internal repair program to correct any issues.
A:AnswerYes, but you will have to format the hard drive from "NTFS" to "FAT32" for it to work on the PS3. You can follow this guide to do that (you will need a computer): https://hddmag.com/how-to-use-an-external-hdd-on-ps3/