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Hello,
Thanks fvdw to post your files and explanations on this forum.
However, I have lost the files (mbr file and others) and the procedure to create the .bin image (150Mb) on your previous internet site.
Can you post the procedure and the files on this forum please ?
Thanks you for your answer.

all you need is in the download section of this forum pich72. Read the topic on how to set up an new hard disk it includes a download how to set up partition sad5 and the files you need for that. Be aware that you will get a basic set up as sda5 contained the nas database with all your settings. The one supplied is a basic file.
The firmware image you have to write to sda1 and sda2 you can subtract form the bin file containing a firmware upgrade it is a bz2 compressed file. You could use a program like 7-zip under windows to unpack it or on a Linux computer using tar -xjvf

Don't know if the master boot record is needed but I will upload it to the new harddisk topic.

Thanks you fvdw,
I think I have found my problem.
I have unpacked the bin file with winrar. But I found just one strange file : ... .bin.out.
Now with 7-zip, I unpacked the file and have a file with no type.
After renaming this file in .bz2 and unpacking it, I find the image, a .bak file and files with no type too.
What are the type of the other files ?
I have the same problem with the master boot record, I have a bin file no an image file.
I have renamed the bin file by a .bz2 file.
After opening with 7-zip, I see 4 files : 0.img, 1.img, 2.img,3.img, and I can't extract these files.
Can you explain me please ?

If you use 7-Zip in windows then extract the bin file, you will get a new file indeed just one file, typically with same name as bin file but without .bin. Now again use 7-zip to extract that file, now you should get the image file ( "name firmware".img) and a bunch of other files like version , MD5, NAME , PLATFORM...
This is how I can do it on my system (windows 7 and using 7-Zip to extract that file)) Its important that you get the correct file as otherwise it will not work,it must be the disk image.

Yes, but the other files have no extension : MD5, NAME, PLATFORM ...
Is it normal ?
I don't think the hard drive could read these files.
For the master boot record, when I extracted the zip file, I had a bin file.
In the bin file, there are 4 image files but no "mbr.img".
How do you do to get just one file named mdr.img ?

yep that is normal and you don't need these other files only the xxx.img file of 150 MB
The other ones are needed when upgrading the firmware via the webinterface of the spd8020

when you download the spda-spd8020-mbr.zip file and you unzip it (not using 7-zip) you will get one file
sda-spd8020-mbr.bin this is the master boot record (it is 512 bytes big)

OK, Thank you.
On your pdf, you used an image file not a bin file for the mbr. That's why I didn't understand.
So, to copy the master boot record on my hard drive, can I use the unix command :
dd if=/path-to-mbr-img/spd8020-mbr.img of=/dev/sdb bs=512 count=1
and replace the .img by the .bin ?

I see that is indeed confusing

yes just replace spd8020-mbr.img by the file name you found in the mbr zip file (sda-spd8020-mbr.bin)

I tried with the fvdw-sl-10-0 firmware.
It works very well.
Thank you fvdw

you are welcome pich72, but also Jocko made great contributions, thank you for your feedback