How Much Space Before 1st Partition? Post: 302926441

Sponsored Content

Top Forums UNIX for Dummies Questions & Answers How Much Space Before 1st Partition? Post 302926441 by mrm5102 on Monday 24th of November 2014 12:34:51 PM

11-24-2014

Registered User

How Much Space Before 1st Partition?

Hello All,

I'm having trouble finding info on how to convert sector size (*if that's really what i want to do?) to something easier to understand.

I'm trying to copy the MBR from a bootable SD Card to another SD Card or image file, but I'm not sure what I should use in my dd command since I'm not positive about how much space is exactly before the 1st partition...

fdisk Output:

Code:

Disk /dev/sdc: 7969 MB, 7969177600 bytes
246 heads, 62 sectors/track, 1020 cylinders, total 15564800 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x5503c906

   Device   Boot    Start        End           Blocks      Id    System
/dev/sdc1   *        2048      516099      257026     83   Linux
/dev/sdc2          518144     5918719    2700288   83   Linux

I read on a site that you can just divide the "Start" number in half to get Kilobytes (*which means there is 1MB before the 1st partition), but I'm not positive if that is accurate or not..?

What should I use as my dd command if I want everything BEFORE the first start'ing sector at 2048 (*i.e. before the 1st partition)?

Something like this?

Code:

# dd  if=/dev/sdc  of=MBR.img  bs=512  count=???

If any has any thoughts or suggestions it would be much appreciated.

Thanks in Advance,
Matt

mrm5102

View Public Profile for mrm5102

Find all posts by mrm5102

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

Swap Partition Space

first of all, sorry about my english...I�m a spanish newbie to this marvelous OS and i have just a couple of doubts...u know? :-) 1) how big should my swap partition be if i installed debian 2.2r3 or FreeBSD 4.x on a AMD k7 1400Mhz with 512Mb of Random Access Memory? i heard that those OS...

2. UNIX for Advanced & Expert Users

moving space from one partition to another

How can I move some space allocated to one partition to another, i.e. from "/var" to "/" . Thanks!

3. Shell Programming and Scripting

Disk space for root partition

Hello, I am trying to monitor disk space for each node on the machine. I am able to get all individual nodes but for the '/' node. For example: df -k: bash-2.05b# df -k Filesystem 1K-blocks Used Available Use% Mounted on /dev/xxx 4127108 2415340 1502120 62% / /dev/yyy ...

4. UNIX for Dummies Questions & Answers

Best ways of increasing space on a partition

Hi, On one of our solaris servers, the root partition has filled up,(it was poorly sized in the first place), Does anyone have any advice about the best way to add space to a partition. I'm sure I've read how to do this somewhere before but just can't remember...:( A colleague has suggested...

5. Red Hat

RHEL 5 supports only 2 TB space for a partition !

Dear Friends , I am using Redhat Ent Linux 5.0 with a EMC storage which HDD space is 4 TB. After Installing RHEL 5 , I get 4 TB space available but when I am going to create a partition then the OS show 2TB available space . I cannot create a partition above 2TB space . Is there any limitation...

6. UNIX for Dummies Questions & Answers

shifting space from one partition to other

hi My System is Sun Microsystems Inc. SunOS 5.10 Solaris Partition Info is /dev/vx/dsk/bootdg/var 27G 25G 1.2G 96% /var /dev/vx/dsk/bootdg/oravol 110G 54G 56G 49% /export/home I want to shift space 20G from /export/home to /var What should be the command ??

7. Slackware

Ideal partition sizes of 17 gb space.

I am planning to install slack 13.37 on an old stand-alone PIII (512 mb ram) with 17 gb disk space. I need to keep lotsa pdf, chm type e-books for programming with few other misc. documents. I'm going to use this system for my personal use. It has no network but I browse internet with cable...

8. Linux

How to increase root space from another partition?

Hi OS Experts I would like to increase root partition from another partition so that I can save more documents in Home and Desktop. whether it is possible without formating root partition if so please explain here is o/p of df -h Filesystem Size Used Avail Use% Mounted on /dev/sda9...

9. Shell Programming and Scripting

How to consume all available space on partition?

Hi I'm doing some resilience testing and need to write a script to consume all of the available disk space on a partition and then to free it up again. This would need to be - Safe Dynamic, in that it calculates the free space prior to consuming it. I might want to go on to consume a...

10. Red Hat

Allot free space from one partition to other

I have a RHEL 5.3 machine with the following partitions and free space: Free space on the partitions / : 74GB /boot : 81MB /var : 73GB /home : 37GB /icat : 758MB /opt : 1.5GB Now is it possible to allot a free space of some other partitions to /opt? I want around 100 GB more space...

LEARN ABOUT OSX

blockdev

BLOCKDEV(8)						       System Administration						       BLOCKDEV(8)

NAME

       blockdev - call block device ioctls from the command line

SYNOPSIS

       blockdev [-q] [-v] command [command...] device [device...]
       blockdev --report [device...]
       blockdev -h|-V

DESCRIPTION

       The utility blockdev allows one to call block device ioctls from the command line.

OPTIONS

       -q     Be quiet.

       -v     Be verbose.

       --report
	      Print  a	report	for  the  specified device. It is possible to give multiple devices. If none is given, all devices which appear in
	      /proc/partitions are shown. Note that the partition StartSec is in 512-byte sectors.

       -h, --help
	      Display help text and exit.

       -V, --version
	      Print version and exit.

COMMANDS

       It is possible to give multiple devices and multiple commands.

       --flushbufs
	      Flush buffers.

       --getalignoff
	      Get alignment offset.

       --getbsz
	      Print blocksize in bytes.

       --getdiscardzeroes
	      Get discard zeroes support status.

       --getfra
	      Get filesystem readahead in 512-byte sectors.

       --getiomin
	      Get minimum I/O size.

       --getioopt
	      Get optimal I/O size.

       --getmaxsect
	      Get max sectors per request

       --getpbsz
	      Get physical block (sector) size.

       --getra
	      Print readahead (in 512-byte sectors).

       --getro
	      Get read-only. Print 1 if the device is read-only, 0 otherwise.

       --getsize64
	      Print device size in bytes.

       --getsize
	      Print device size (32-bit!) in sectors. Deprecated in favor of the --getsz option.

       --getss
	      Print logical sector size in bytes - usually 512.

       --getsz
	      Get size in 512-byte sectors.

       --rereadpt
	      Reread partition table

       --setbsz bytes
	      Set blocksize. Note that the block size is specific to the current file descriptor opening the block device, so the change of  block
	      size only persists for as long as blockdev has the device open, and is lost once blockdev exits.

       --setfra sectors
	      Set filesystem readahead (same like --setra on 2.6 kernels).

       --setra sectors
	      Set readahead (in 512-byte sectors).

       --setro
	      Set  read-only.  The currently active access to the device may not be affected by the change. For example filesystem already mounted
	      in read-write mode will not be affected. The change applies after remount.

       --setrw
	      Set read-write.

AUTHOR

       blockdev was written by Andries E. Brouwer and rewritten by Karel Zak.

AVAILABILITY

       The blockdev command is part of the util-linux package and is available from https://www.kernel.org/pub/linux/utils/util-linux/.

util-linux							    August 2010 						       BLOCKDEV(8)

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

Swap Partition Space

Discussion started by: I[X]ION

2. UNIX for Advanced & Expert Users

moving space from one partition to another

Discussion started by: jason6792

3. Shell Programming and Scripting

Disk space for root partition

Discussion started by: chiru_h

4. UNIX for Dummies Questions & Answers

Best ways of increasing space on a partition

Discussion started by: kenny123m