I haven't actually used a synology, but if you can map a drive to it from Windows, then you can use "standard" file copy tools. This will help with the restarting.
I have used this with excellent results. It can skip files that it has already copied, and if it runs into a bad sector on the drive, it will retry a configurable amount of times.
I recommend doing several passes. The first time, set it to a low time out and 0 retries. This will copy over as much healthy data as possible. This way, if the drive dies, at least you have something. Then for the second pass, set it to skip existing files, and then increase retries to 3. This should get a bunch more files. Then do a third pass with a much longer time out and a a few more retries.
I also recommend unplugging your drive for a few hours after each pass. It will get very hot, and I found this to make it more prone to disconnect or time out. Letting it cool down seemed to help. You might also try /u/GldRush98's fridge/freezer suggestion. I haven't done that before, but I have know many people swear by it...
One thing you may want to do, after you do the initial pass to copy the easy data, let Windows run a disk check and try to repair the drive. Depending on why it is actually crashing, this could reduce the frequency of that. Instructions here. This will take a long time (possibly a few days) depending on the health of the drive and the size. Then resume the copy jobs to retrieve the rest of the data.
I'm going to go with something that you probably haven't heard of:
Unstoppable Copier from Roadkil.net
This is a great little app for copying whole folder trees between drives or partitions on Windows.
We've literally used it to move entire network shares between servers running Win Server 2003 and 2008 in work.
As the name suggests, it's unstoppable. It can be set to skip damaged or corrupt files, and I've only ever seen it struggle with a badly corrupted SD card. Even then it only skipped the one corrupt file that was messing everything up.
The portable version is really worth keeping on a pen drive somewhere.
One more thing: as this screenshot shows, the program icon is a picture of a cat.
OK. Your D drive definitely seems to be failing. Use Roadkil's unstoppable copier to transfer the files to the SSD. It may take a looong time as there may be bad sectors on the HDD. Be prepared to lose some files though as they may be unrecoverable if the sectors on which they reside are badly damaged.
And do not use the HDD until the copy is complete as you may cause more damage to it making more files unrecoverable
I have rarely had any success in reading from damaged disks in the past. However, you may want to give these two apps a shot. Hopefully they will work for you.
The file is probably corrupt, although the codec can work through corrupt parts and carry on, windows file copy sees and raises an error... You could try another tool to force the copy of the corrupt file:
Found this on google ....
It sounds like your 2DS is booting from the copy of Luma on the NAND instead of from your SD card. It is quite possible your SD card is failing, as they can sometimes become read-only when they stop working.
Start by copying everything on your SD card to your PC. (I recommend Roadkil's Unstoppable Copier.) Then get a new SD card, format it to FAT32, and test it with h2testw – or format your current SD card and test it with h2testw. Then copy all the files back to the card again.
You may have SD card corruption. A good start would be to copy everything to your PC (I suggest using a tool like Roadkil's Unstoppable Copier ). Then format the card and test it for errors with h2testw – or get a new card, format it properly, and test it with h2testw. Then copy everything back. That might be enough to fix it. (It's good to back up your SD card every now and then anyway.)
Do not try to delete mysterious items in FBI or Data Managament. That will likely make things worse.
At 0.017 price per GB, that 8TB deal is one of the best right now. Easily shuckable, however note that some controllers don't play nice with its 3.3v plug (fixable with tape)
As for your second question, back in the day Roadkill's unstoppable copier was a good windows utility for this, I am sure it still works fine but I am sure someone else has a more elegant solution.
Robocopy is always a good solution for this as well (https://pureinfotech.com/robocopy-recover-and-skip-files-with-errors-from-bad-hard-drive-in-windows/)
If you're on a windows computer, use a program called Unstoppable Copier. It transfers the data regardless of size without breaking it. (Used for PS2 files onto a fat32 myself.)
Disconnect and power down everything. Re-connect. Try again. If still slow try drive in another computer. If still slow use something like unstoppable copier to copy your data before doing anything else. That is your priority, once your data is safe you'll have time to experiment.
WD passports are a bitch because they have propietary controller and connectors unlike many other externals, which have a USB adapter plugged into a regular SATA header. This makes pulling them out and doing standadrd data recovery impossible. WD will replace the drive under warranty but your data will be lost.
Good luck.
How important is the data? If it's critically important to you I wouldn't mess around with trying to recover it yourself. It's possible you could make the data irretrievable. If that's acceptable to you then there are things you can try.
First. Do NOT write ANY data at all to that drive. Recover the files to somewhere else.
Since the drive seems accessible I would start with Roadkil's Unstoppable Copier and move on to more advanced methods if that fails.