Same issue as potatis
potatis were you able to resolve your large drive issue?
I have exactly the same problem as you and am unsure of how to fix it. I am using a brand new Samsung 1TB drive, Model #: ST1000LM024
What is more is that I am running AtvCloner on OSX 10.8.2 and am unable to bypass the permission denied issue even when I run AtvCloner as root via sudo. The reason I know I have the same issue is that I tried to manually partition the drive using the procedure here...
http://wiki.awkwardtv.org/wiki/Prepare_a_Hard_Drive
...and here is what I get:
/dev/disk1
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *1.0 TB disk1
1: EFI 285.2 MB disk1s1
2: Apple_Recovery 3.4 GB disk1s2
3: Apple_HFS 7.5 GB disk1s3
4: Apple_HFS Media 989.0 GB disk1s4
start size index contents
0 1 PMBR
1 1 Pri GPT header
2 32 Pri GPT table
34 6
40 69632 1 GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B
69672 819200 2 GPT part - 5265636F-7665-11AA-AA11-00306543ECAC
888872 1843200 3 GPT part - 48465300-0000-11AA-AA11-00306543ECAC
2732072 75408048 4 GPT part - 48465300-0000-11AA-AA11-00306543ECAC
78140120 7
78140127 32 Sec GPT table
78140159 1 Sec GPT header
... below is the output of AtvCloner when I run it as root using sudo...
New ATV Disk (Diskutil) Setup
Adding OSBoot partition with got
New ATV Disk (Diskutil) Setup
Adding OSBoot partition with got
Copying osboot.img with dd
Copying recovery.img with dd
Started partitioning on disk1
Unmounting disk
Creating the partition map
Waiting for the disks to reappear
Formatting disk1s2 as Mac OS Extended with name AtvTargetDrive
Initialized /dev/rdisk1s2 as a 931 GB HFS Plus volume
Mounting disk
Finished partitioning on disk1
/dev/disk1
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *1.0 TB disk1
1: EFI 209.7 MB disk1s1
2: Apple_HFS AtvTargetDrive 999.9 GB disk1s2
Unmount of all volumes on disk1 was successful
gpt destroy: unable to open device '/dev/disk1': Permission denied
got create: unable to open device '/dev/disk1': Permission denied
Unmount of all volumes on disk1 was successful
got add: unable to open device '/dev/disk1': Permission denied
Unmount of all volumes on disk1 was successful
got add: unable to open device '/dev/disk1': Permission denied
Unmount of all volumes on disk1 was successful
got add: unable to open device '/dev/disk1': Permission denied
Unmount of all volumes on disk1 was successful
got add: unable to open device '/dev/disk1': Permission denied
Unmount of all volumes on disk1 was successful
Unable to find disk for /dev/disk1s4
Unmount of all volumes on disk1 was successful
gpt remove: unable to open device '/dev/disk1': Permission denied
Unmount of all volumes on disk1 was successful
gpt remove: unable to open device '/dev/disk1': Permission denied
Unmount of all volumes on disk1 was successful
gpt remove: unable to open device '/dev/disk1': Permission denied
Unmount of all volumes on disk1 was successful
got add: unable to open device '/dev/disk1': Permission denied
Unmount of all volumes on disk1 was successful
got add: unable to open device '/dev/disk1': Permission denied
Unmount of all volumes on disk1 was successful
got add: unable to open device '/dev/disk1': Permission denied
Unmount of all volumes on disk1 was successful
dd: /dev/disk1s3: Permission denied
Unmount of all volumes on disk1 was successful
dd: /dev/disk1s1: Permission denied
Unmount of all volumes on disk1 was successful
dd: /dev/disk1s2: Permission denied
Unmount of all volumes on disk1 was successful
newfs_hfs: cannot create filesystem on /dev/rdisk1s4: No such file or directory
Unmount of all volumes on disk1 was successful
Unmount of all volumes on disk1 was successful
got show: unable to open device '/dev/disk1': Permission denied
/dev/disk0
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *750.2 GB disk0
1: EFI 209.7 MB disk0s1
2: Apple_HFS Macintosh HD 749.3 GB disk0s2
3: Apple_Boot Recovery HD 650.0 MB disk0s3
/dev/disk1
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *1.0 TB disk1
1: EFI 209.7 MB disk1s1
2: Apple_HFS AtvTargetDrive 999.9 GB disk1s2