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I need to copy one disk to another. I tried with the command below and it takes nearly a day to copy 1 TB of filesdisk.

dd if=/dev/sda of=/dev/sdb 

I have tried the same on a Unix system with the command below and it completes within a few hours

dd if=/dev/sda of=/dev/rdsk

What is the alternative I could use to copy thefrom disk to disk as faster?

I need to copy one disk to another. I tried with the command below and it takes nearly a day to copy 1 TB of files.

dd if=/dev/sda of=/dev/sdb 

I have tried the same on a Unix system with the command below and it completes within a few hours

dd if=/dev/sda of=/dev/rdsk

What is the alternative I could use to copy the disk faster?

I need to copy one disk to another. I tried with the command below and it takes nearly a day to copy 1 TB of disk.

dd if=/dev/sda of=/dev/sdb 

I have tried the same on a Unix system with the command below and it completes within a few hours

dd if=/dev/sda of=/dev/rdsk

What is the alternative I could use to copy from disk to disk as faster?

4 edited title
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why is rdsk not available on linux Why dd takes too long?

3 grammar and wording changes
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I need to copy one disk to another. I tried with the command below and it takes nearly a day to copy 1 TB of files.

dd if=/dev/sda of /dev/sdb

dd if=/dev/sda of=/dev/sdb 

I have tried the same on a Unix system with the command below and it completes within a few hours

dd if=/dev/sda of=/dev/rdsk

dd if=/dev/sda of=/dev/rdsk

What is the alternative I could use to copy the disk faster?

I need to copy one disk to another. I tried with the command below and it takes nearly a day to copy 1 TB of files.

dd if=/dev/sda of /dev/sdb

I have tried the same on a Unix system with the command below and it completes within a few hours

dd if=/dev/sda of=/dev/rdsk

What is the alternative I could use to copy the disk faster?

I need to copy one disk to another. I tried with the command below and it takes nearly a day to copy 1 TB of files.

dd if=/dev/sda of=/dev/sdb 

I have tried the same on a Unix system with the command below and it completes within a few hours

dd if=/dev/sda of=/dev/rdsk

What is the alternative I could use to copy the disk faster?

2 grammar and wording changes
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