You’re going to additionally want a usb harddisk&#a hundred and sixty;enclosure to attach the original and new 2.5" IDE drive to your computer. It costs under $10.
Download ATVCloner from here
Extract the ATVCloner archive and drag the extracted application into your Applications folder.
Insert your original AppleTV harddrive into the enclosure, connect the enclosure to your computer, and launchATVCloner from your Applications folder.
ATVCloner will do a disc scan and display the result in the Activity Log. Locate yo
ur original Apple TV harddrive from the list and input its id into the Source Device ID field.
Your original drive will have 4 partitions: EFI, Apple_Recovery, Apple_HFS OSBoot, and Apple_HFS Media. The drive id will look something like /dev/disk7.
You will be asked to confirm the action. Click the Continue button.
Once ATVCloner has created the boot.dmg, efi.dmg, and recovery.dmg files, the program will let you know it has completed. Click the OK button.
You can now disconnect your original Apple TV drive and connect the new drive to your computer. Click to select the Partition New Drive tab and ATVCloner will once again do a scan of the drives connect.
Take a look at the recovery log and copy the new drive's id into the Target Device ID field. Use the size and volume name to help identify the new drive.
Click the Choose… button for the Boot Image Path, EFI Image Path, and Recovery Image Path and select the corresponding boot.dmg, efi.dmg, and recovery.dmg we created earlier.
During the process of creating the new drive you will be prompted four times with The disk you inserted was not readable by this computer. message. Click the Ignore button.