What was your biggest Technician Oopsie?

[Cave_Dweller]

..... I have however, fdisked the wrong drive.... ooops!

I've done that. Fortunately the client had backups of most of her files.

[CeeBee]

Interesting, my circuitry design class taught me that a phone line was around 1.2 volts and when active due to calls/ringing up to 15v

Ask for a refund...
Just think that 1.2V would be hardly enough to make the simplest silicon transistor based amplifier work since Vbe=0.6-0.7V

[NooNoo]

I've done that. Fortunately the client had backups of most of her files.

That's all I did, so recovery was easy.

[Auric]

Phone line voltages jump b/w -48 and +48 volts, (96v total potential) so it doesn't surprise me.

I've actually done something similar, I adding a new phone jack @ home, and while i was doing it the phone rang. My Arm went numb.

Another electrical oops, I was hooking up a 2000 watt audio amp in a theatre, when some dumb tech hit the power button on the amp.

Worst computer error i've ever done? Well lets see, lol, I ran a sql 2000 DTS job to update a table from test > production, only problem I updated the data as well.

Had an HD fail in our old raid array here, so we were trying to replace it. Something happened pooched the array so it had to be rebuilt and restored from tape. 8mm tape to be exact, not to mention the fact that it took the better part of a day and a half to restore 220gb of data.

(I love my new LTO3 drive hehe)