Maybe I did not express myself clearly. Its seems to me that whatever the
original value of pt_entry_t.status on the disk was, encode part will
always write 0x80 or 0x00, effectively clearing all the other bits.
Regards,
Jiri
---------- Původní zpráva ----------
Od: Dominik Taborsky <[email protected]>
Datum: 5. 5. 2013
Předmět: Re: [HelenOS-devel] libmbr & hdisk update
"Jiri,
one more thing. I'd like to discuss this:
>> It think if you read a label with libmbr, then make no changes and
>> write it,
>> you should not get any changes on your disk. I don't think this is the
>> case.
>> As an example, you will loose any partition flags besides 0x80. I think
>> you
>> need to be really careful when messing with the label, which could be
>> created by other OSes and you don't have to understand all their
>> features
>> and constraints.
>
> OK, will fix that.
I said I would fix it, since I found parted has some flags. But I tried
applying almost all flags to MBR partition and none of them made any
difference regarding the status byte. What I mean is this:
http://www.gnu.org/software/parted/manual/html_chapter/parted_2.html#SEC28
None of those flags apart from 'boot' change the status field. And I
couldn't find any other source that would say there are any other flags in
use.
I get your point of saving previous data, but I just want to know if you
have any more info on this. I could incorporate that into the library.
By the way, to save the status byte I will need at least another byte in
the mbr_part_t structure. Just FYI.
Dominik
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