SSD upgrade for mid 2012 MBP I recently started getting performance issues with my MBP while running apps like Xcode and Eclipse. A quick diagnostic of the system showed that it thrashed over 458k times.

Vendor Specific SMART Attributes with Thresholds:
ID# ATTRIBUTE_NAME          FLAG     VALUE WORST THRESH TYPE      UPDATED  WHEN_FAILED RAW_VALUE
  1 Raw_Read_Error_Rate     0x000b   095   095   062    Pre-fail  Always       -       458757


I just ordered a SSD to replace the HDD, will this help solve the problem, and also how do I get OSX back onto the computer if I replace the HDD and the new SSD is empty?
Put it in an external caddy, USB etc, then use something like Carbon Copy Cloner to duplicate it.

It will then be bootable when you swap.