Last week my hard drive failed on my july 2009 macbook pro (the first 13") and the warranty is up. I shopped around for options and settled on a samsung 1TB off of OWC. I assumed since i couldn't find my snow leopard and i had leopard laying around that I would just be able to replace the hard drive and then boot from the disk and install easily. I held down "c" and it started the process etc. I was following a guide that said to go into disk utilities and erase it to be able to install it, but thats where a ton of errors are happening. most notably a "imput/output error" and without being able to erase/format the disk it wont let me install. I'm beginning to think it's just a fluke hard drive that i need to send it back for a new one but this post is my last resort beforehand in the offchance that it's me missing a step. i've tried reading other peoples solutions but they are often trying with externals or have their old data backed up on externals. I've never had to do anything like this on a mac. thanks in advance and sorry for the long read, it's been a headache. (ill be back on in the morning)