Do you want a 320GB HDD? Don't have that much cash? Well I'll show you how to upgrade your HDD for a fraction of the price. What you will need: Have read the Q&A at the bottom 360 HDD shell (phat 360 only - you can just stick the HDD into slims) A compatible HDD (see list below) T6 and T10 torx screw driver The correct hddss.bin, (120GB HDD get a 120GB hddss.bin or for 320GB+ HDD get the 320GB hddss.bin. I can not post the files of the hddss.bin due to the rules.) A USB flash drive (anything over 1GB will do) A computer with SATA ports MS DOS boot image (I can't post it do to the rules) Hddhackr Hp flasher List of working HDD (Western Digital only) Scorpio Series WD600BEAS - 60GB WD800BEAS - 80GB WD1000BEAS - 100GB WD1200BEAS - 120GB WD1600BEAS - 160GB WD2000BEAS - 200GB WD2500BEAS - 250GB WD600BEVS - 60GB WD800BEVS - 80GB WD1000BEVS - 100GB WD1200BEVS - 120GB WD1600BEVS - 160GB WD2000BEVS - 200GB WD2500BEVS - 250GB Scorpio Blue Series WD3200BEVS - 320GB WD600BEVT - 60GB WD800BEVT - 80GB WD1200BEVT - 120GB WD1600BEVT - 160GB WD2000BEVT - 200GB WD2500BEVT - 250GB WD3200BEVT - 320GB WD4000BEVT - 400GB WD5000BEVT - 500GB WD6400BEVT - 640GB WD1600BPVT - 160GB WD2500BPVT - 250GB WD3200BPVT - 320GB WD5000BPVT - 500GB WD6400BPVT - 640GB WD7500BPVT - 750GB WD2500LPVT - 250GB WD3200LPVT - 320GB WD5000LPVT - 500GB WD10TPVT - 1TB Scorpio Black Series WD800BEKT - 80GB WD1200BEKT - 120GB WD1600BEKT - 160GB WD2500BEKT - 250GB WD3200BEKT - 320GB WD5000BEKT - 500GB WD800BJKT - 80GB WD1200BJKT - 120GB WD1600BJKT - 160GB WD3200BJKT - 320GB WD5000BJKT - 500GB WD3200BPKT - 320GB WD5000BPKT - 500GB WD7500BPKT - 750GB AV-25 Series WD1600BUDT - 160GB WD2500BUDT - 250GB WD3200BUDT - 320GB WD5000BUDT - 500GB VelociRaptor Series WD1500HLFS - 150GB WD1600HLFS - 160GB WD3000HLFS - 300GB WD1500BLFS - 150GB WD1600BLFS - 160GB WD3000BLFS - 300GB Step One: The Files Open up HP Format Tool and select your flash drive. Under "file system" select "FAT32". Click on "create a DOS start up disk". Select your DOS boot image and press start. Put hddhackr and your hddss.bin file on your newly formatted flash drive.. Step Two: Opening Your Case (Phat Only) There are four T6 torx screws near each corner (one is hidden under the MS seal). After removing them, pull the case apart into two pieces. There are now four T10 torx screws on the metal enclosure to remove. Once they are removed, slide the metal off. Unplug the SATA plug and slide the HDD out. Step Three: Plugs Open your computer and unplug every HDD that is in your computer. Plug in your USB drive and the HDD you are going to flash. Step Four: The Flashing Boot your computer and load the flash drive with DOS on it. In ms-dos type "hddhackr". A bunch of numbers and drives will be listed, type the number of your hdd (mine was 5). You will be asked if you want to dump, flash, or restore. We want flash so type "F". Next type the name of your hddss.bin. If it asks you to name a backup file just put "UNDO". Now you will be asked "Do you want to flash to create xbox360 compatible firmware?" Type "Y". If it says "And do you also want to create partition 0/2/3", type "Y" again. Your drive will be flashed. Step Five: About Done After flashing it remove your newly flashed HDD. Reassemble your HDD and put it in your 360. On your 360 go to your settings and then your storage to check if it worked. If it is corrupted, just format it with your 360. Q&A How do I transfer my saves? Put them on a USB flash drive before starting the tutorial. What is that undo.bun it made on my flash drive? The undo.bin is a bin file to restore you drive back to normal. I have a slim how do I put the HDD in? Just stick it in like so Will this void my 360's warranty? It will not void the console's warranty. I get an error after typing the name of my hddss.bin file. You did not type the name correctly (don't forget about capitalized letters i.e ".BIN"). This is my first tutorial More pics are coming as soon as I can find my torx set Thank you Nathan Drake and Isaac for proof reading!