Re: how not to initialize HD

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On 08/06/2010 04:49 PM, Michael Schwendt wrote:
> On Fri, 6 Aug 2010 03:55:05 +0000 (UTC), JB wrote:
> 
>> JB <jb.123abc <at> yahoo.com> writes:
>>
>> Hi,
>> let me follow the previous post with another example.
>>
>> One more "rule to follow" with regard to partitions:
>> http://www.lissot.net/partition/partition-03.html
>> ...
>> Unlike primary partitions, logical partitions must be contiguous. Each logical
>> partition contains a pointer to the next logical partition, ...
>>
>> OK.
>> Now another example of a disk layout (also Paul Cartwright's, but a different
>>  computer - Dell XPS desktops):
>> Btw Paul, is that disk also partitioned by Anaconda tool ?
>>
>> Between partitions 2 and 4 there is a free space marked as "logical".
>>  
>>    Logical   219463964*  219463964      0           1*Free Space           
>> None
>>
>> It is clearly outside of the Extended partition range.
>> How comes it is called "logical" if it violates the rule of contiguousness ?
> 
> You might want to examine the cfdisk source code to find out. cfdisk does
> not claim it would be a valid partition. It just prints a partition type
> for the free space, and that already could be a bug. Happens here, too:
> 
>                First       Last
>  # Type       Sector      Sector   Offset    Length   Filesystem Type (ID) Flag
> -- ------- ----------- ----------- ------ ----------- -------------------- ----
>  1 Primary           0      390625*     1#     390626*Linux (83)           Boot
>  2 Primary      390626*     781250*     0      390625*Linux (83)           None
>  3 Primary      781251*   39062500*     0    38281250*Linux (83)           None
>    Logical    39062501*   39070079      0        7579*Free Space           None

The space immediately above lies between the end of partition 3 and the start of
partition 4 (the extended partition).

It is unused, and *UNUSABLE* space (unusable, due to the fact that it is
*impossible* to map it with a partition id given your current partition layout).

Labeling it as "logical" is, well, not logical, in that it isn't a logical
partition. In fact, it's not a partition at all, as noted by the fact that it
doesn't have a partition id #). Labling it as "void" or "void space" would
probably be a more accurate description of this disk space.

The only way to claim this space would be to backup everything on the disk,
repartition without leaving a "void", and then restore.

- -Greg

>  4 Primary    39070080   976768064      0   937697985 W95 Ext'd (LBA) (0F) None
>  5 Logical    39070080    78124094     63    39054015 Linux (83)           None
>  6 Logical    78124095   117194174     63    39070080 Linux (83)           None
>  7 Logical   117194175   156248189     63    39054015 Linux (83)           None
>  8 Logical   156248190   195318269     63    39070080 Linux (83)           None
>  9 Logical   195318270   203125859     63     7807590 Linux swap / So (82) None
> 10 Logical   203125860   976768064     63   773642205 Linux LVM
> (8E)       None
> 
>  
>> # cfdisk -Ps
>> Partition Table for /dev/sda
>>
>>                First       Last
>>  # Type       Sector      Sector   Offset    Length   Filesystem Type (ID) 
>> Flag
>> -- ------- ----------- ----------- ------ ----------- -------------------- ----
>>  1 Primary           0      128519     63      128520 Dell Utility (DE)    
>> None
>>  2 Primary      128520   219463963*     0   219335444*HPFS/NTFS (07)       
>> Boot
>>    Logical   219463964*  219463964      0           1*Free Space           
>> None
>>  4 Primary   219463965   615401954      0   395937990 W95 Ext'd (LBA) (0F) 
>> None
>>  5 Logical   219463965   223672994     63     4209030 Linux swap / So (82) 
>> None
>>  6 Logical   223672995   265618709     63    41945715 Linux (83)           
>> Boot
>>  7 Logical   265618710   615401954     63   349783245 Linux (83)           
>> None
>>  3 Primary   615401955   625137344      0     9735390 CP/M / CTOS / . (DB) 
>> None
>>
>> # fdisk -l
>>
>> Disk /dev/sda: 320.1 GB, 320072933376 bytes
>> 255 heads, 63 sectors/track, 38913 cylinders
>> Units = cylinders of 16065 * 512 = 8225280 bytes
>> Disk identifier: 0xe686f016
>>
>>    Device Boot      Start         End      Blocks   Id  System
>> /dev/sda1               1           8       64228+  de  Dell Utility
>> /dev/sda2   *           9       13661   109667722    7  HPFS/NTFS
>> /dev/sda3           38308       38913     4867695   db  CP/M / CTOS / ...
>> /dev/sda4           13662       38307   197968995    f  W95 Ext'd (LBA)
>> /dev/sda5           13662       13923     2104483+  82  Linux swap / Solaris
>> /dev/sda6   *       13924       16534    20972826   83  Linux
>> /dev/sda7           16535       38307   174891591   83  Linux
>>
>> JB
>>
>>


- -- 
+---------------------------------------------------------------------+

Please also check the log file at "/dev/null" for additional information.
                (from /var/log/Xorg.setup.log)

| Greg Hosler                                   ghosler@xxxxxxxxxx    |
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