On 24 August 2010 22:42, Ramnarayan.K <[email protected]> wrote:
> Hi > > Am using an external HD with some data along with my onboard hard disk. > > My own board HD has 4 physical partitions as follows > Lenovo recovery, > Wincedows OS, > Wincedows Recovery > 1 logical extended driver with the following > > Swap > root > home > bakup > 2ndroot > > ** > My external HD has about the same about 6 partitions - > > But due to some problems i got an error which led me to this bug > https://bugs.launchpad.net/ubuntu/+source/e2fsprogs/+bug/521648 > > which leads me to ask - so how many partitions - physical, logical internal > and external can Linux Handle at one go > > ram > > > Hi, Well I cannot answer for the number of physical disks. I have never had more than 2-3 (internal + external) connected at any one time. As for the partitioning, you can have only 4 primary partitions using the FAT partition table that we use even now. The last 64 bytes of the MBR ( of 512 bytes) of the disk contain the partition table. If you use GPT (http://en.wikipedia.org/wiki/GUID_Partition_Table) , then I guess you can have more than 4 primary partitions, but I have never used it. I believe Mac systems use GPT though. I have hit a limitation when the partitions on a single physical disk go beyond sdX15. I have not been able to create a sdX16. So according to this, I guess on a single disk, you can have 3 primary partitions, with the 4th primary partition being the extended partition. And within the extended partition you could go from sdX5 to sdX15, from what I have experienced myself ! My laptop internal HDD (320GB) has the following partitioning layout: ---------------------------------------------------------------- Disk /dev/sda: 320.1 GB, 320072933376 bytes 255 heads, 63 sectors/track, 38913 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Disk identifier: 0xe395e395 Device Boot Start End Blocks Id System /dev/sda1 * 1 6374 51199123+ 7 HPFS/NTFS /dev/sda2 6375 38913 261369517+ f W95 Ext'd (LBA) /dev/sda5 6375 12748 51199123+ c W95 FAT32 (LBA) /dev/sda6 12749 22309 76798701 7 HPFS/NTFS /dev/sda7 31871 34415 20442681 83 Linux /dev/sda8 34416 38670 34178256 83 Linux /dev/sda9 38671 38913 1951866 82 Linux swap / Solaris /dev/sda10 26522 31870 42965811 b W95 FAT32 /dev/sda11 22310 22334 200781 83 Linux /dev/sda12 22335 24321 15960546 8e Linux LVM /dev/sda13 24322 24354 265041 83 Linux /dev/sda14 24355 26521 17406396 8e Linux LVM ---------------------------------------------------------------------------- - output of fdisk -l :) <http://en.wikipedia.org/wiki/GUID_Partition_Table>Thanks & Regards, Nandan V
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