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Writing to 2 SD cards at the same time

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0

I would like to write an image at two SD cards at the same time. I envision at least two concurrent writing scenarios:

1. Is it possible to write the image with a tee or similar bifurcating mechanism?


2. 
   

   Is it possible to execute the cat command from two different BASH shells?

   
   
   

   sudo sh -c 'cat sdcard.image >/dev/sdb'
   
   sudo sh -c 'cat sdcard.image >dev/mmcblk0'
   
   

   
   

I can foresee a problem in that if the two targets can be written at different rates, then it may be necessary to throttle write speed down so as to not overload the slower writer.
The image is large: the ability to burn multiple targets is a significant advantage.

cat sd-card tee

share|improve this question

edited 42 mins ago

muru

38.7k593168

asked 1 hour ago

gatorbackgatorback

310112

add a comment | 

0

I would like to write an image at two SD cards at the same time. I envision at least two concurrent writing scenarios:

1. Is it possible to write the image with a tee or similar bifurcating mechanism?


2. 
   

   Is it possible to execute the cat command from two different BASH shells?

   
   
   

   sudo sh -c 'cat sdcard.image >/dev/sdb'
   
   sudo sh -c 'cat sdcard.image >dev/mmcblk0'
   
   

   
   

I can foresee a problem in that if the two targets can be written at different rates, then it may be necessary to throttle write speed down so as to not overload the slower writer.
The image is large: the ability to burn multiple targets is a significant advantage.

cat sd-card tee

share|improve this question

edited 42 mins ago

muru

38.7k593168

asked 1 hour ago

gatorbackgatorback

310112

add a comment | 

I would like to write an image at two SD cards at the same time. I envision at least two concurrent writing scenarios:

1. Is it possible to write the image with a tee or similar bifurcating mechanism?


2. 
   

   Is it possible to execute the cat command from two different BASH shells?

   
   
   

   sudo sh -c 'cat sdcard.image >/dev/sdb'
   
   sudo sh -c 'cat sdcard.image >dev/mmcblk0'
   
   

   
   

I can foresee a problem in that if the two targets can be written at different rates, then it may be necessary to throttle write speed down so as to not overload the slower writer.
The image is large: the ability to burn multiple targets is a significant advantage.

cat sd-card tee

share|improve this question

edited 42 mins ago

muru

38.7k593168

asked 1 hour ago

gatorbackgatorback

310112

share|improve this question

edited 42 mins ago

muru

38.7k593168

asked 1 hour ago

gatorbackgatorback

310112

share|improve this question

edited 42 mins ago

muru

38.7k593168

asked 1 hour ago

gatorbackgatorback

310112

edited 42 mins ago

muru

38.7k593168

edited 42 mins ago

muru

38.7k593168

asked 1 hour ago

gatorbackgatorback

310112

asked 1 hour ago

gatorbackgatorback

310112

2 Answers
2

active

oldest

votes

0

This is bare minimum shell script for concurrent copying. If any errors this will throw them to STDERR.

#!/bin/sh

echo "Image file ${1}"

echo "1st SD Card Path ${2}"

echo "2nd SD Card Path ${3}"



dd if=${1} of=${2}&

dd if=${1} of=${3}

Usage sh script.sh image_file first_card_path second_card_path

share|improve this answer

edited 41 mins ago

muru

38.7k593168

answered 43 mins ago

fossilfossil

29114

add a comment | 

0

Is it possible to write the image with a tee or similar bifurcating mechanism?

sudo tee /dev/sdb /dev/mmcblk0 < sdcard.image

share|improve this answer

answered 40 mins ago

murumuru

38.7k593168

add a comment | 

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0

This is bare minimum shell script for concurrent copying. If any errors this will throw them to STDERR.

#!/bin/sh

echo "Image file ${1}"

echo "1st SD Card Path ${2}"

echo "2nd SD Card Path ${3}"



dd if=${1} of=${2}&

dd if=${1} of=${3}

Usage sh script.sh image_file first_card_path second_card_path

share|improve this answer

edited 41 mins ago

muru

38.7k593168

answered 43 mins ago

fossilfossil

29114

add a comment | 

0

This is bare minimum shell script for concurrent copying. If any errors this will throw them to STDERR.

#!/bin/sh

echo "Image file ${1}"

echo "1st SD Card Path ${2}"

echo "2nd SD Card Path ${3}"



dd if=${1} of=${2}&

dd if=${1} of=${3}

Usage sh script.sh image_file first_card_path second_card_path

share|improve this answer

edited 41 mins ago

muru

38.7k593168

answered 43 mins ago

fossilfossil

29114

add a comment | 

This is bare minimum shell script for concurrent copying. If any errors this will throw them to STDERR.

#!/bin/sh

echo "Image file ${1}"

echo "1st SD Card Path ${2}"

echo "2nd SD Card Path ${3}"



dd if=${1} of=${2}&

dd if=${1} of=${3}

Usage sh script.sh image_file first_card_path second_card_path

share|improve this answer

edited 41 mins ago

muru

38.7k593168

answered 43 mins ago

fossilfossil

29114

#!/bin/sh

echo "Image file ${1}"

echo "1st SD Card Path ${2}"

echo "2nd SD Card Path ${3}"



dd if=${1} of=${2}&

dd if=${1} of=${3}

share|improve this answer

edited 41 mins ago

muru

38.7k593168

answered 43 mins ago

fossilfossil

29114

edited 41 mins ago

muru

38.7k593168

edited 41 mins ago

muru

38.7k593168

answered 43 mins ago

fossilfossil

29114

answered 43 mins ago

fossilfossil

29114

0

Is it possible to write the image with a tee or similar bifurcating mechanism?

sudo tee /dev/sdb /dev/mmcblk0 < sdcard.image

share|improve this answer

answered 40 mins ago

murumuru

38.7k593168

add a comment | 

0

Is it possible to write the image with a tee or similar bifurcating mechanism?

sudo tee /dev/sdb /dev/mmcblk0 < sdcard.image

share|improve this answer

answered 40 mins ago

murumuru

38.7k593168

add a comment | 

Is it possible to write the image with a tee or similar bifurcating mechanism?

sudo tee /dev/sdb /dev/mmcblk0 < sdcard.image

share|improve this answer

answered 40 mins ago

murumuru

38.7k593168

sudo tee /dev/sdb /dev/mmcblk0 < sdcard.image

share|improve this answer

answered 40 mins ago

murumuru

38.7k593168

answered 40 mins ago

murumuru

38.7k593168

answered 40 mins ago

murumuru

38.7k593168