The below command make a bit to bit copy of your hardriwe

sudo dd if=/dev/sda of=/dev/sdb conv=sync,noerror

With:

• /dev/sda is the input(source drive)
• /dev/sdb is the output(target drive)
• sync,noerror must be used in combination, so dd will not stop if it encounter an error by reading the input.

For more information read the Wikipedia page about dd.

• You must be root (use sudo)
• The target harddrive must have the same or a bigger size than the source harddrive.
• The both harddrives must be unmounted.
• Make sure your don't need your computer in the next days
• Make sure your computer is in a room where it will not disturb or be disturbed by anyone

I made a clone of my SAMSUNG HD103SJ 1TB 7200T to my_harddrives:Seagate Barracuda ST2000DM001 2TB using my EeePC and two SATA to USB2 Adapters. I do not recommend this hardware configuration, better will be to plug the two HDDs in your desktop computer, but mine is ten years old and the motherboard don't have SATA connectors . The source disk was encrypted using crypsetup.

It took 320488 seconds ⇒ 5341.46 minutes ⇒ 89 hours ⇒ 3.7 days to dd mya 1TB HDD on a 2TB HDD. Below the output of dd:

thomas@thomas-1005PE:~$ sudo dd if=/dev/sdc of=/dev/sdd conv=sync,noerror
[sudo] password for thomas: 
dd: reading `/dev/sdc': Input/output error
421304+0 records in
421304+0 records out
215707648 bytes (216 MB) copied, 40.9582 s, 5.3 MB/s
dd: reading `/dev/sdc': Input/output error
421304+1 records in
421305+0 records out
215708160 bytes (216 MB) copied, 42.1408 s, 5.1 MB/s
dd: reading `/dev/sdc': Input/output error
421304+2 records in
421306+0 records out
215708672 bytes (216 MB) copied, 43.3579 s, 5.0 MB/s
dd: reading `/dev/sdc': Input/output error
421304+3 records in
421307+0 records out
215709184 bytes (216 MB) copied, 44.5749 s, 4.8 MB/s
dd: reading `/dev/sdc': Input/output error
1212908+4 records in
1212912+0 records out
621010944 bytes (621 MB) copied, 178.415 s, 3.5 MB/s
dd: reading `/dev/sdc': Input/output error
1492411+5 records in
1492416+0 records out
764116992 bytes (764 MB) copied, 227.273 s, 3.4 MB/s
dd: reading `/dev/sdc': Input/output error
1492411+6 records in
1492417+0 records out
764117504 bytes (764 MB) copied, 228.499 s, 3.3 MB/s
dd: reading `/dev/sdc': Input/output error
1492411+7 records in
1492418+0 records out
764118016 bytes (764 MB) copied, 229.732 s, 3.3 MB/s
dd: reading `/dev/sdc': Input/output error
1492411+8 records in
1492419+0 records out
764118528 bytes (764 MB) copied, 231.115 s, 3.3 MB/s
dd: reading `/dev/sdc': Input/output error
1492411+9 records in
1492420+0 records out
764119040 bytes (764 MB) copied, 233.185 s, 3.3 MB/s
dd: reading `/dev/sdc': Input/output error
1492411+10 records in
1492421+0 records out
764119552 bytes (764 MB) copied, 234.41 s, 3.3 MB/s
dd: reading `/dev/sdc': Input/output error
1492411+11 records in
1492422+0 records out
764120064 bytes (764 MB) copied, 235.669 s, 3.2 MB/s
dd: reading `/dev/sdc': Input/output error
1492411+12 records in
1492423+0 records out
764120576 bytes (764 MB) copied, 237.317 s, 3.2 MB/s
dd: reading `/dev/sdc': Input/output error
2322179+13 records in
2322192+0 records out
1188962304 bytes (1.2 GB) copied, 377.092 s, 3.2 MB/s
dd: reading `/dev/sdc': Input/output error
2322179+14 records in
2322193+0 records out
1188962816 bytes (1.2 GB) copied, 378.334 s, 3.1 MB/s
dd: reading `/dev/sdc': Input/output error
3684321+15 records in
3684336+0 records out
1886380032 bytes (1.9 GB) copied, 608.109 s, 3.1 MB/s
dd: reading `/dev/sdc': Input/output error
3684321+16 records in
3684337+0 records out
1886380544 bytes (1.9 GB) copied, 609.343 s, 3.1 MB/s
dd: reading `/dev/sdc': Input/output error
3684321+17 records in
3684338+0 records out
1886381056 bytes (1.9 GB) copied, 610.618 s, 3.1 MB/s
dd: reading `/dev/sdc': Input/output error
3684321+18 records in
3684339+0 records out
1886381568 bytes (1.9 GB) copied, 611.851 s, 3.1 MB/s
dd: reading `/dev/sdc': Input/output error
3684321+19 records in
3684340+0 records out
1886382080 bytes (1.9 GB) copied, 613.077 s, 3.1 MB/s
dd: reading `/dev/sdc': Input/output error
3684321+20 records in
3684341+0 records out
1886382592 bytes (1.9 GB) copied, 614.302 s, 3.1 MB/s
dd: reading `/dev/sdc': Input/output error
3684321+21 records in
3684342+0 records out
1886383104 bytes (1.9 GB) copied, 615.528 s, 3.1 MB/s
dd: reading `/dev/sdc': Input/output error
5216426+22 records in
5216448+0 records out
2670821376 bytes (2.7 GB) copied, 876.311 s, 3.0 MB/s
dd: reading `/dev/sdc': Input/output error
5216426+23 records in
5216449+0 records out
2670821888 bytes (2.7 GB) copied, 877.536 s, 3.0 MB/s
dd: reading `/dev/sdc': Input/output error
5216426+24 records in
5216450+0 records out
2670822400 bytes (2.7 GB) copied, 878.778 s, 3.0 MB/s
dd: reading `/dev/sdc': Input/output error
5216426+25 records in
5216451+0 records out
2670822912 bytes (2.7 GB) copied, 880.004 s, 3.0 MB/s
dd: reading `/dev/sdc': Input/output error
5216426+26 records in
5216452+0 records out
2670823424 bytes (2.7 GB) copied, 881.229 s, 3.0 MB/s
dd: reading `/dev/sdc': Input/output error
5216426+27 records in
5216453+0 records out
2670823936 bytes (2.7 GB) copied, 882.463 s, 3.0 MB/s
dd: reading `/dev/sdc': Input/output error
5216426+28 records in
5216454+0 records out
2670824448 bytes (2.7 GB) copied, 883.696 s, 3.0 MB/s
dd: reading `/dev/sdc': Input/output error
5216426+29 records in
5216455+0 records out
2670824960 bytes (2.7 GB) copied, 884.93 s, 3.0 MB/s
dd: reading `/dev/sdc': Input/output error
101456890+30 records in
101456920+0 records out
51945943040 bytes (52 GB) copied, 16783 s, 3.1 MB/s
dd: reading `/dev/sdc': Input/output error
491670505+31 records in
491670536+0 records out
251735314432 bytes (252 GB) copied, 80749.2 s, 3.1 MB/s
1953525136+32 records in
1953525168+0 records out
1000204886016 bytes (1.0 TB) copied, 320488 s, 3.1 MB/s
thomas@thomas-1005PE:~$

Despite of the input/ouput errors the copy worked and I was able to open the encrypted partition and to mount it on my linux system.