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Groups > comp.programming > #5422
| From | "Bill Cunningham" <nospam@nspam.invalid> |
|---|---|
| Newsgroups | comp.programming |
| Subject | Re: fat32 and boot sector |
| Date | 2015-05-06 23:41 -0400 |
| Organization | A noiseless patient Spider |
| Message-ID | <miemr9$279$1@dont-email.me> (permalink) |
| References | (1 earlier) <fl7lkahegvmbj3lbqpplp20chr7t6k9q6k@4ax.com> <mie9vg$2f1$1@dont-email.me> <16elka5pl7gu314o4a47osonkl127lrak6@4ax.com> <mieg8v$a79$1@dont-email.me> <mfhlka5fkhj3n44vinhofdh77b4ikduudq@4ax.com> |
"Robert Wessel" <robertwessel2@yahoo.com> wrote in message
news:mfhlka5fkhj3n44vinhofdh77b4ikduudq@4ax.com...
> The traditional MS scheme for partitioning is fairly well described
> at:
>
> http://en.wikipedia.org/wiki/Master_boot_record
>
> As are overviews of several others.
>
> Basically up to four primary partitions can exist, each with a 16-byte
> entry, starting at 0x1be in the partition boot sector (MBR). Usually
> you can just look at the last eight bytes to find the first sector and
> total size of each partition. Other parts of each entry determine
> whether it's active and bootable, and several other things.
I am looking at the last 4 bytes in little endian order and it makes a
hex value. I translate that into decimal and it tells me a large value
multiply that by 512 and I get number of sectors. That seems to be an LBA
size which would begin with sector 0. The other stuff seems to be a pain to
calculate it's old c/h/s values. Is that necessary to calculate in order to
find beginning sector in LBA not physical geometry that not even right to
find a sector for first sector of a partition that is the boot sector?
That's what I want is each partition's boot sector on the filesystem.
Bill
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fat32 and boot sector "Bill Cunningham" <nospam@nspam.invalid> - 2015-05-06 15:32 -0400
Re: fat32 and boot sector Robert Wessel <robertwessel2@yahoo.com> - 2015-05-06 18:30 -0500
Re: fat32 and boot sector "Bill Cunningham" <nospam@nspam.invalid> - 2015-05-06 20:01 -0400
Re: fat32 and boot sector Robert Wessel <robertwessel2@yahoo.com> - 2015-05-06 20:07 -0500
Re: fat32 and boot sector "Bill Cunningham" <nospam@nspam.invalid> - 2015-05-06 21:49 -0400
Re: fat32 and boot sector Robert Wessel <robertwessel2@yahoo.com> - 2015-05-06 21:24 -0500
Re: fat32 and boot sector "Bill Cunningham" <nospam@nspam.invalid> - 2015-05-06 23:41 -0400
Re: fat32 and boot sector "Bill Cunningham" <nospam@nspam.invalid> - 2015-05-06 23:42 -0400
Re: fat32 and boot sector Robert Wessel <robertwessel2@yahoo.com> - 2015-05-07 01:23 -0500
Re: fat32 and boot sector "Bill Cunningham" <nospam@nspam.invalid> - 2015-05-07 13:18 -0400
Re: fat32 and boot sector Robert Wessel <robertwessel2@yahoo.com> - 2015-05-09 00:01 -0500
Re: fat32 and boot sector JJ <jj4public@vfemail.net> - 2015-05-08 00:26 +0700
Re: fat32 and boot sector "Bill Cunningham" <nospam@nspam.invalid> - 2015-05-07 14:17 -0400
Re: fat32 and boot sector JJ <jj4public@vfemail.net> - 2015-05-09 21:49 +0700
Re: fat32 and boot sector Robert Wessel <robertwessel2@yahoo.com> - 2015-05-09 00:03 -0500
Re: fat32 and boot sector JJ <jj4public@vfemail.net> - 2015-05-09 21:55 +0700
Re: fat32 and boot sector Robert Wessel <robertwessel2@yahoo.com> - 2015-05-09 11:43 -0500
Re: fat32 and boot sector JJ <jj4public@vfemail.net> - 2015-05-10 16:05 +0700
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