Selling MBP simply erase hd & install lion or buy a new hd?

[Trance]

when i sell my mbp how to I protect my data from being retrieved reinstall lion or buy and install a fresh hd?

 

[simsaladimbamba]

You securely erase the HDD using the ZERO OUT option in Disk Utility started from the Recovery Partition, then reinstall Mac OS X and shut down the Mac before you have to create an account (like you have to when first starting a Mac after having bought it).

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Links to guides on how to use Disk Utility, the application Mac OS X provides for managing internal and external HDD/SSDs and its formats.

Guide on how to use Disk Utility from the restore / installation DVD.

Using Disk Utility - Formatting, Partitioning, Verifying, and Repairing Disks

which includes:

• Format, Erase, or Reformat a Drive
• Erase or Reformat a Partition
• Add a Partition
• Deleting and Resizing Partitions
• Disk Formats

and some more guides
​

DiskWiping – One Pass is Enough​

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Mac 101: Preparing your old Mac for sale or recycling