I downloaded mavericks but the install failed. The message stated there was an error with the disk which required repairing.

Help please!  I downloaded mavericks but the install failed. The message stated there was an error with the disk which required repairing. Using disk utility repair disk is not available ( greyed out) and verify disk stops and says disc requires repairing. So the online support page suggests I erase the disc and reinstall then back up from time machine ( I have a recent backup). But when I try to erase the Macintosh HD I get the message volume erase failed with the error couldn't unmount disk.
I'd be very grateful for any help anyone can give me.
I have a macbook pro 17" mid 2009-  running on snow leopard 10.6.8 ...  I lost the snow leopard disk so I don't know what to do from there ... I tried restarting by clicking SHIFT (safe mode) after the chime comes up,  but It doesnt seem to make any difference ... please help !!
thank you sooo much
many many thanks for your hep guys !!

Whenever you install a new version of OS X being installed, the disk is checked just as if you were using Disk Utility checks the disk to see if the disk is damaged. And,, from what you report, your disk is damaged and needs to be replaced. This isn't a fault with Mavericks - your disk may have been failing for years.
It's a very good thing that you've a recent backup as you're going to need it. I would suggest that you evaluate what functionality that you need in a new disk and go shopping at OWC for a new drive - HGST (or any Hitachi), Seagate SSHDs or Toshiba drives are all good. Be sure that you buy an enclosure for the 'new' drive so that you can format it using Disk Utility before installing it into your machine - you can get one of those from OWC as well.
Good luck - call back with any questions...
Clinton

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