site_archiver@lists.apple.com Delivered-To: darwin-kernel@lists.apple.com Irman, *** example *** Device block size=512, Number of Blocks=1024000 DeviceType=0x0, DeviceId=0x0 Command (? for help): -- Cliff On 22-Feb-05, at 10:26 PM, Imran wrote: Hi Cliff, Thanks Imran -----Original Message----- From: Cliff Russell [mailto:crussell@atimi.com] Sent: Wednesday, February 23, 2005 12:42 AM To: Imran Cc: darwin-kernel@lists.apple.com Subject: Re: ContentHint Issue 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 set 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 ** Device block size=512, Number of Blocks=1024000 DeviceType=0x0, DeviceId=0x0 Device block size=512, Number of Blocks=1024000 DeviceType=0x0, DeviceId=0x0 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 _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel@lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/ cliff_russell%40atimi.com This email sent to cliff_russell@atimi.com -- Cliff _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel@lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.a... If the disk has already been initialized (with Disk Utility or whatever), the 't' (change a partition's type) command should do the trick for you. (Just don't use the 'i' command, it will erase all the previous partitions). [CLIFFR-PB:~] cliffr% pdisk Top level command (? for help): e /dev/rdisk1 /dev/rdisk1 Command (? for help): p /dev/rdisk1 map block size=512 #: type name length base ( size ) 1: Apple_partition_map Apple 63 @ 1 2: Apple_HFS Apple_HFS_Untitled_2 341336 @ 64 (166.7M) 3: Apple_HFS Apple_HFS_Untitled_3 341336 @ 341400 (166.7M) 4: Apple_HFS Apple_HFS_Untitled_4 341248 @ 682736 (166.6M) 5: Apple_Free 0+@ 1023984 Command (? for help): t Partition number: 2 New partition type: MACOSX_MyContent Command (? for help): t Partition number: 3 New partition type: MACOSX_MyContent Command (? for help): t 4 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 Apple_HFS_Untitled_2 341336 @ 64 (166.7M) 3: MACOSX_MyContent Apple_HFS_Untitled_3 341336 @ 341400 (166.7M) 4: MACOSX_MyContent Apple_HFS_Untitled_4 341248 @ 682736 (166.6M) 5: Apple_Free 0+@ 1023984 Thanks for your immediate reply. Actually my problem is that I want to change ContentHint of those partitions which are already created on disk through DiskUtil. So that I shall be able to load my filter scheme driver for those partitions whose ContentHint matches to that of my driver. So is there any way to change/modify the ContentHint of already created partition instead of creating new partition. [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) 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) 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 This email sent to cliff_russell@atimi.com _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel@lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/ cliff_russell%40atimi.com This email sent to site_archiver@lists.apple.com