Re: ContentHint Issue
Re: ContentHint Issue
- Subject: Re: ContentHint Issue
- From: Cliff Russell <email@hidden>
- Date: Tue, 22 Feb 2005 11:50:26 -0800
Irman,
In your case your are initializing the partition, this writes an empty
partition map to the disk (wiping out all previous partitions) and then
changing the type of the free partition ('Apple_Free') to you custom
type ('MACOSX_MyContent'). Your missing the step where you create your
own partitions.
You can either use 'c' to create partitions with the standard type
('Apple_HFS') and then change the type with 't', or do it all in one
step using 'C'. See example below
Use the 'p' print command after each step to see what is actually
happening to the partition map.
Also take a look at "Secrets of the partition map" section TN1189: The
Monster Disk Driver Technote and/or the various header files
(IOApplePartitionScheme.h for IOKit or AppleDiskPartitions.h) for more
information.
** example **
[CLIFFR-PB:/] cliffr% pdisk
Top level command (? for help): e
Name of device: /dev/rdisk1
/dev/rdisk1
Command (? for help): i
map already exists
do you want to reinit? [n/y]: y
size of 'device' is 1024000 blocks (512 byte blocks):
new size of 'device' is 1024000 blocks (512 byte blocks)
Command (? for help): p
/dev/rdisk1 map block size=512
#: type name length base ( size )
1: Apple_partition_map Apple 63 @ 1
2: Apple_Free Extra 1023936 @ 64 (500.0M)
Device block size=512, Number of Blocks=1024000
DeviceType=0x0, DeviceId=0x0
Command (? for help): C
First block: 64
Length in blocks: 511968
Name of partition: Snap1
Type of partition: MACOSX_MyContent
Command (? for help): p
/dev/rdisk1 map block size=512
#: type name length base ( size )
1: Apple_partition_map Apple 63 @ 1
2: MACOSX_MyContent Snap1 511968 @ 64 (250.0M)
3: Apple_Free Extra 511968 @ 512032 (250.0M)
Device block size=512, Number of Blocks=1024000
DeviceType=0x0, DeviceId=0x0
Command (? for help): C
First block: 512032
Length in blocks: 511960
Name of partition: Snap2
Type of partition: MACOSX_MyContent
Command (? for help): p
/dev/rdisk1 map block size=512
#: type name length base ( size )
1: Apple_partition_map Apple 63 @ 1
2: MACOSX_MyContent Snap1 511968 @ 64 (250.0M)
3: MACOSX_MyContent Snap2 511960 @ 512032 (250.0M)
4: Apple_Free Extra 8 @ 1023992
Device block size=512, Number of Blocks=1024000
DeviceType=0x0, DeviceId=0x0
Command (? for help):
-- Cliff
On 22-Feb-05, at 1:38 AM, Imran wrote:
Hi,
I have 2 partitions named ‘Snap1’ and ‘Snap2’ on the a disk
‘/dev/rdisk1’ and want to change ContentHint of one partition to
‘MACOSX_MyContent’ instead of ‘Apple_HFS’, so that my driver gets
loaded only for that particular partition whose ContentHint matches.
How can I change the content hint of single partition out of 2
partitions on a disk.
I have tried this using pdisk but it changes the partition type of
whole disk to ‘MACOSX_MyContent’ and all the partitions disappear for
/dev/rdisk1. Steps taken to do the same are
# pdisk
Top:level command (? for help): e // to edit the partition
Top:level command (? for help): i // to initialize the disk
/dev/rdisk1
Top:level command (? for help): t // to change partition type
Top:level command (? for help): w // to write the partition map
Below is the output of pdisk after changing partition type:
Top:level command (? for help): L
/dev/rdisk2 map block size=512
#: type name length base (
size )
1: Apple_partition_map Apple 63 @ 1
2: Apple_HFS Extra 143374680 @ 64 (
68.4G)
Device block size=512, Number of Blocks=143374744
DeviceType=0x0, DeviceId=0x0
/dev/rdisk1 map block size=512
#: type name length base (
size )
1: Apple_partition_map Apple 63 @ 1
2: MACOSX_MyContent Extra 143374680 @ 64 (
68.4G)
Device block size=512, Number of Blocks=143374744
DeviceType=0x0, DeviceId=0x0
/dev/rdisk3 map block size=512
#: type name length base (
size )
1: Apple_partition_map Apple 63 @ 1
2: Apple_Free 0+@ 64
3: Apple_HFS Apple_HFS_Untitled_4 143112520 @ 262208
( 68.2G)
4: Apple_Free 0+@ 143374728
Device block size=512, Number of Blocks=143374744
DeviceType=0x0, DeviceId=0x0
/dev/rdisk0 map block size=512
#: type name length base (
size )
1: Apple_partition_map Apple 63 @ 1
2: Apple_Free 0+@ 64
3: Apple_HFS Apple_HFS_Untitled_2 64961408 @ 262208
( 31.0G)
4: Apple_Free 0+@ 65223616
5: Apple_HFS Apple_HFS_Untitled_3 64961408 @ 65485760
( 31.0G)
6: Apple_Free 0+@ 130447168
7: Apple_HFS Apple_HFS_Untitled_4 13252672 @ 130709312
( 6.3G)
8: Apple_Free 0+@ 143961984
9: Apple_HFS Apple_HFS_Untitled_5 12077344 @ 144224128
( 5.8G)
10: Apple_Free 0+@ 156301472
Device block size=512, Number of Blocks=156301488
DeviceType=0x0, DeviceId=0x0
Thanks and Regards,
Imran
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Cliff
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