Brother DS-640 Compact Mobile Document Scanner, (Model: DS640) 1.5"x2"x11.9"

TLDR: if the full software package from brother doesn't install, it starts and then nothing happens, do this simple trick that worked for me on two different computers.1) log into your Windows account with administrator privileges. Make ANOTHER user account with administrator privileges, call it it temp or whatever (does not need a password but you do you).2) log out of your Windows session, and log into the new temp account.3) install the brother software package for your product (ds-640 or ds-940dw). It should work. Just give it a little bit. When it's done installing and you've verified it works, log out.Log back into your account and verify everything works. You may delete the temporary administrator account. Enjoy.

Great product! Fast shipping!

Great, portable space saving

So, let's start this off by saying one this -- Yes! The DS-640 is a great scanner... HOWEVER.. It does have some issues that bring it down a peg or two..I'll start this off by highlighting the positives --It's portable. It's easy to use. It's lightweight.On the downside --It's infuriating after scanning only a few documents that you're told "OH NO! We're out of memory!" .. The first time it happened I stared at the message on-screen and thought to myself.. How the heck can it be out of memory when I have 64 GB of high-speed RAM in the computer... Then I remembered that the chips inside these scanners have temporary memory built-in... but then the kicker... ...buuut I only scanned TWO PAGES... They were 3 color (black, blue, red) documents and standard paper size. It's not like it was a full-size poster in crisp detail at maximum resolution, bitrate, with edits... This was a major failure of the design, and was actually my first experience with the scanner, which as I don't need to mention, is NOT GOOD! A terrible look for the BRAND, as this was my first ownership of their brand's product, and not good for the future of this little new device sitting on my desk with the threat of return, due to a degraded trust in the product. If it's going to fail me on day one, what's it going to do on day 365?That brings me on to my next quarrel with this device. Resolution and color limitations by size. If I want to scan a sheet of paper at the fullest-size available for this device in the MAXIMUM allowed quality (resolution and color and bitrate), why am I limited from doing so by software? We physically know the scanner can do it, because we can do it with other smaller sheets and the compliance with the HARDWARE is there... but for some reason, I get rejected by software when I want to actually use the product to its fullest potential, hardware wise.With auto document sizing set to "On" you can only scan stuff at a resolution of 300x300 dpi, regardless of being set to black and white or full 24-bit color.The device does have a slider to control a guide for paper size, but it's so flimsy and loose in the track that even if a document does start to kink to one side, it's pushing that guide out of the way. No sense in even having it there, really.The port on this scanner is not a generic connection, and requires a dedicated special cable to hookup to your PC by USB, so don't expect to be able to head down to your local PC repair shop and snag a new cable after your pet gerbil decided that the big thick black cable looked like a delicious after-dinner licorice dessert.With all this in mind, choose carefully.If you're using this to scan documents in an office setting, it's fine, I guess. Just be ready to scan that 43-page packet 5 times over until the software quits telling you that it magically ran out of memory.If you're using this to scan photos, whip out the old handy-dandy ruler and be ready to fight with size-presets telling you that you can't use the fullest scan quality on auto-sizing.As the package says -- Be sure to save your box and packing materials, in case you do ever need to send the unit back in for service or repairs. I recommend buying a wet/dry scanner cleaning kit.

I love this little scanner especially for what I paid (can't beat it)! Perfect for what I need at my desk and it fits under my computer monitor when I don't need it. Also set up was fast and I was able to start scanning in no time.

As other's have mentioned, this scanner can result in frequent blue screen events. When it does work, it scans well. I scanned a total of 3 documents, each time, I experienced a blue screen on Windows 11. What happens, is that if you leave it connected after the scan, Windows seems not to like that, and retaliates with the dreaded blue screen. And that's only about a minute or so after you scan something, so if you have another sheet queued up to scan, you'll be out of luck. On the third instance of this, my machine complained badly after the blue screen, and on reboot, went into safe mode, and took a few minutes to boot, when normally it boots in about 20 seconds.Pros:1. Scans well if you can get past the blue screen that frequently happens.2. The resolution can go quite high, but it's finicky and makes you change other settings each time you scan.3. It's fast and impressive4. It's compact, easy to tuck out of the way into a desk drawer5. It would be almost perfect if not for the blue screen issue.Cons:1. Tends to blue screen on Windows 11, as others have mentioned.2. The On/Off button is sensitive and finickyOverall, this device is completely unacceptable, I did not find any fixes or upgraded drivers on the Brother site.I purchased this scanner, but tucked it away, still in it's box for while before using it, so the return window has closed. $100 is not a lot for a scanner, but still, that's a nice chunk of change to loose on a defective item. I intend to contact Brother and request a complete refund, siting the multiple mentions of blue screen events here on Amazon. I'll update this post as that process proceeds.

Great product