Re: how not to initialize HD

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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
 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
> 
> 
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