I booted up my ThinkPad W520 with a low battery. It went through a normal boot and didn't have enough power in the battery so it shut down. After that I can't boot. It comes up and says the boot device isn't recognized and wants me to repair by inserting Windows 7 Installation disk. I don't have the installation disk. And i don't have the SATA cable to connect it to another PC to see if the data is still there. Based on the fact it isn't recognizable, is all of my data toast? Is it recoverable at any level?