partmap 15 limit Revisited

[mascarasnake]

As an afterthought, I'd still like to know why Panther is creating those 
   whaked partitions

Daniel Gimpelevich wrote:
> mascarasnake <dontdrill <at> earthlink.net> writes:
> 
> 
>>Before my question, just a note to Dr. Clint. One of the reasons *nix is 
>>so great; I type this email from my 586 (FC1) ssh -X'd into my 7500 
>>while I try to rearrange my drives on my G3. Maybe a little too geeky, 
>>but, damn that's cool.
>>
>>Now my question -
>>
>>Has anyone else had this funky partmap thing come up? I'm unable to 
>>combine the partitions using pdisk on the mac side, using Disk Druid, or 
>>using anaconda's pdisk.
>>_______________________________________________
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>>
>>
> 
> 
> If you look at the major and minor device numbers in the /dev/hdXX and /dev/sdXX
> entries you will see that /dev/hdXX entries advance to the next disk every 64
> minor device numbers, but /dev/sdXX entries advance to the next disk every 16
> minor device numbers! That means that while the Linux kernel could theoretically
> address 63 partitions on IDE devices, only 15 are possible on SCSI or
> SCSI-emulated devices. This flaw is built into the Linux kernel by design, and
> I'm not sure why. This limitation is present on ALL Linux computers, regardless
> of platform or partitioning scheme. I believe it's very likely that this will
> NEVER be fixed.
> 
> It is possible to use the pdisk on the YDL 3.0.1 (not 3.0) rescue disk to
> combine adjacent free partitions. Use the 't' command on the second free
> partition in a row and change the type to 'crap' or some such thing. Then delete
> that partition. Voila! One Apple_Free partition!
> 
> 
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