By turning it off with the back switch all the risk you get is to turn it off while it's writing to the HDD (mostly with official HDD only games such as Final Fantasy XI) or while copying data or even while it's saving to the MC which will probably cause a blue box with a nifty "corrupted data" title in it. (Sometimes corrupted data is undeletable so avoid it. Such a situation would require a MC format or a advanced tool like uLAUNCHELF to have it fixed.)
SCPH-10000_GH-001 SCPH-15000_GH-003 SCPH-18000_GH-008 SCPH-30001_GH-005 SCPH-30000_GH-016(V4) SCPH-30001_GH-010(V4)
2xSCPH-10190, 2xSCPH-10350, 2xSCPH-10280
"**** j0 hackers!"
-Sjeep (As seen on TOXIC OS ELF...)