SanDisk - Ultra 256GB USB 3.0 Flash Drive - Black
User rating, 4.8 out of 5 stars with 3406 reviews.
4.8(3,406 Reviews)- 93 Answered Questions
If received today, the last day to return this item would be Jul 20. Learn more ˃
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Description

Find the ideal drive for your needs.
Learn more in the Drives and Storage Buying GuideFeatures
Stores up to 256GB
To provide ample space for photos, videos and more.
USB 3.0 interface
Ensures efficient performance. Backward compatible with USB 2.0.
Read speeds up to 100MB/sec.
For fast access to your data.
File encryption and password protection
Safeguard sensitive files. Includes a 1-year subscription to RescuPro file recovery software.
What's Included
- SanDisk-Ultra® USB 3.0 Flash Drive, 256GB
Key Specs
- Storage Capacity256 gigabytes
- Connector Type(s)USB Type A
- USB GenerationUSB 3.0
- Maximum Read Speed130 megabytes per second
- Password ProtectionYes
General
- Product NameUltra 256GB USB 3.0 Flash Drive
- BrandSanDisk
- Model NumberSDCZ48-256G-A46
- ColorBlack
- Color CategoryBlack
Capacity
- Storage Capacity256 gigabytes
Connectivity
- Connector Type(s)USB Type A
- USB GenerationUSB 3.0
Speed
- Maximum Read Speed130 megabytes per second
Feature
- Password ProtectionYes
- RetractableYes
Dimension
- Product Height0.31 inches
- Product Width0.42 inches
- Product Depth0.87 inches
- Product Weight0.48 ounces
Compatibility
- Lanyard AttachmentYes
Warranty
- Manufacturer's Warranty - Parts5 years
- Manufacturer's Warranty - Labor5 years limited
Other
- UPC619659125967
Customer reviews
Rating 4.8 out of 5 stars with 3406 reviews
(3,406 customer reviews)Rating by feature
- Value4.7
Rating 4.7 out of 5 stars
- Quality4.8
Rating 4.8 out of 5 stars
- Ease of Use4.8
Rating 4.8 out of 5 stars
- Pros mentioned:Backup, Storage capacityCons mentioned:Limitations, Material
Rated 4 out of 5 stars
A Flash Drive with Cloud BackUp
|Posted .I really like that the Sandisk USB 3.0 256gb flash drive has plenty of space for all of my music files, videos, and documents. Even though it is stated as 256gb drive, actual available storage space is 233gb. Build quality on the drive is poor. The all plastic enclosure is loose and wobbly and it gives the impression that it can break off if inserted or removed with force. You’ll need to handle this drive with care. I performed a non-scientific test of write speed. I transferred 27 gb of music files to the flash drive and it took 27 minutes, so 1gb/min. The drive does become warm during file transfer, but the amount of heat generated appears normal. The flash drive comes with two useful software to enable file security and access. The first is Sandisk’s Secure Access Vault which is a file encryption software. You simply create a password and encrypt your files by dropping them into the Sandisk Vault. They are then electronically locked or encrypted. Nobody will be able to access your files without the decryption password. The only way to access the files is to enter your password in the Vault. Another handy tool is Sandisk Flashback. Flashback automates the backup process by transferring the entire contents in the flash drive to Sandisk’s Cloud. You’ll be able to view and download the contents in the flash drive online without having the flash drive physically present. This becomes handy if you either left your flash drive at home or, worse, lost your flash drive entirely. You can recover all of your backed up content online. You can also share files with anyone by simply sending them a link to access the files in your Sandisk Cloud without having to attach large files onto an e-mail. In order for all of this to function, Flashback software needs to be installed locally on your desktop or laptop computer to upload files to Sandisk’s Cloud server. You’ll also need to create an account on the Sandisk Flashback website to access your files in Sandisk’s Cloud server. Flashback is free for the 1st year, after that you’ll need to pay an annual subscription fee to continue access to your backed up files in the Sandisk Cloud. I’ve attached a picture showing the subscription pricing at the time of my review. One limitation of the cloud backup feature is that backing up to the Sandisk cloud only works if you have the flash drive connected to a computer that has the Flashback software installed. In practice, there are numerous instances where you’ll be using the drive at a workstation, say at work computer or a friend’s computer, where the Flashback software isn’t installed. The flash drive becomes a regular, run of the mill storage drive. There’s nothing wrong with this, you just simply need to be aware that no Cloud back up is being performed until you plug the flash drive back into your computer that has the Flashback software installed. Another limitation is that if you have files encrypted in the Sandisk Vault, those encrypted files will naturally remain encrypted, as they should, when backed up to the Sandisk Cloud. However, there is no way for you to access the encrypted files online in the Sandisk Cloud website since you won’t be able to decrypt the files without the Sandisk Vault. The encrypted files can only be decrypted locally from within the flashdrive. All in all, this is a decent high capacity flash drive with some extra bonus features for securing your files and automatically backing up your flash drive to the cloud. I would recommend the flash drive.
I would recommend this to a friend - Pros mentioned:Backup, Speed, Storage capacity
Rated 5 out of 5 stars
Fast with lot of room
|Posted .I wanted to get a large flash drive to backup all my important files and photos “I’ve amassed a lot”, and saw the prices of flash drives has come way down. I started using flash/thumb drives for work back when the 1gb was considered a large drive, and when they announced a 4gb drive we all though “who’s going to put that much stuff on a thumb drive”. I’ve also used about every brand of flash drive available and still have a few of the old 1gb ones laying around and the only ones still working are the SanDisk branded ones, one in particular is the SanDisk Cruzer Titanium 1gb, the super heavy duty all metal bodied drive you won’t ever see again, and it still works perfectly. Physical Impressions: This 256gb drive is physically the size thumb drive have pretty much been for quite a while now, the USB plug is retractable keeping it safe and secure when retracted. There isn’t an activity light so you won’t know if it’s doing anything, “not important for me as it’s on the back of my desktop computer”. Speed: The flash drive is USB 3 and backwards compatible. Speed wise using Crystal Disk Mark I’m getting around 116MB/s Seq read, and 50MB/s Seq write, not bad at all and I’ve attached a screen shot of the test. Included Software: The really nice thing is the software that’s included with the flash drive. You get one year of Rescue Pro Deluxe, “the key is inside the packaging” and with it you can recover lost and accidentally erased files. It works for everything not just this thumb drive. I took a file folder with photos in it, about 1gb worth on the SanDisk drive, deleted it, emptied the recycle bin, and then had the software scan to recover it. Now it does take a while to scan this drive, “it’s big” so sit back or do something else while it goes about its business. After about an hour it was able to recover all the files in the test folder I created, now this will depend greatly on if you’ve written files to the drive after losing/accidentally deleting files. For the most accurate and thorough recovery you don’t want to be using the media you are doing the recovery on till after you’ve recovered your files. You’ll also have to rename your recovered files after it has finished running, but you can click on them to view in the recovery window so you know what you are renaming. Also under the flash drives main directory is the SanDisk Secure Access application. When you run it the first time it will ask that you set up an account and password for the secure folder. After entering your password you will be greeted with a simple file manager window. Just drag and drop files into the top secure area and it will encrypt all the files. If you view the drive with a standard file manager like the one in Windows 10 you will see the folder name but there’s nothing in them to view, you will have to use the Secure Access application to view and unencrypt these files and folders. The whole process is reasonably fast too. I copied all my important stuff, about 175gb, in a couple hours, not bad for that much data. There is an upgrade option for the standard software, you can get a lifetime license for $15, “I think that’s reasonable just haven’t done it yet”. It gets you 1024 bit encryption, automatic backup, syncing between devices, and sharing with others. I’ll probably be upgrading to this in the future as it adds a lot of for low cost. I’m keeping all my medical files on this as I do have some health issues and like to keep my entire medical easily portable if I happen to go see a new specialist. This way I can always have a backup of my records and there’s plenty of space on this drive for x-rays and, MRI’s, CT scans and Ultrasounds. Plus with everything being encrypted “I used a very secure password” I won’t worry much about someone getting my personal information if I do happen to lose the drive. Opinion: This is an excellent thumb drive, there’s plenty of space for a lot of files, and I mean a lot. The included software allows you to encrypt your sensitive data so you won’t have to worry about it falling into the wrong hands and the recovery software makes it pretty easy to recover any file you may have accidentally lost. The new flash drives from SanDisk are a real value.
I would recommend this to a friend Rated 5 out of 5 stars
Great for a senior citizen and a computer.
||Posted .Bought SanDisk flash drive to backup my computer.It is a great help for a senior citizen to know that everything is working ok.Thanks SanDisk!
I would recommend this to a friendFeatures
Value5 out of 5Quality5 out of 5Ease of Use5 out of 5Rated 5 out of 5 stars
This is the beginning I guess, of something great!
||Posted .Owned for 3 weeks when reviewed.SanDisk makes amazing flash drives & finally they're in high capacity like I always imagined great for video from phone and camcorder transfers.
Features
Value5 out of 5Quality5 out of 5Ease of Use5 out of 5I would recommend this to a friend- Pros mentioned:Backup, Price, Storage capacity
Rated 5 out of 5 stars
Decently fast, interesting storage services
|Posted .Cloud continues to be all the rage in 2019, and SanDisk is riding the wave with the new SanDisk Ultra USB thumb drive. It offers a generous 256GB of storage for a reasonable price, but also includes a year of cloud backup for said drive. 256GB of cloud storage for a full year is included making this disk an excellent value if you are looking for a cost effective backup drive. The SanDisk Ultra 256GB is not overly different from other SanDisk drives. It's clad in a semi-gloss black with a slide mechanism to protect the type-A usb port when not in use. It's a tried and true design, and SanDisk rightfully doesn't mess with what works. Performance wise, the disk boasts performance up to 100MB/s. This claim is not exaggerated for sequential read speeds (in other words, large files). Crystal disk mark placed sequential read speeds around 135MB/s. The drive appears to use a fast write cache buffer. Sequential writes hover around 65MB/s for the first gigabyte or so but sharply and predictably drop off to 20-25MB/s. Writes in bursts benefit from this cache, but it can easily fill up during large writes. The cache recovers pretty quickly however, so writing performs well in small batches. This squarely puts the SanDisk Ultra in the budget category as far as performance goes. The real interesting proposition with this drive is the cloud storage that comes with it free for the first year. You can backup all the data found on your drive - meaning that if you have a 256GB drive, you can backup that amount of data to the online 'FlashBack' service. I tested this theory by copying our family photos of around 70GB to the drive. While this took quite a while to accomplish, the backup took place during the copy, so I left it overnight. The FlashBack service not only had a copy of all my files, but presented them with a friendly photo browser, and broke down my files based on metadata, type, and provided a handy search feature. The user interface is modern and worked well with my files. You can share links to files, which is a plus, and manage those links. Essentially you could share out a document with someone, and then revoke the access to that link by simply deleting the sharing link. It's clear there was a lot of time spent to ensure a positive user experience with this service, which is appreciated. The app used to do the backup is unobtrusive and seemed to work well. It does get angry if it’s in the process of backing up files and you unplug it. It does take time to get to resuming a backup. If you delete files, they’ll go in the ‘Trash’ bin in FlashBack, and can be restored for up to 30 days. The first year is on the house, but after that pricing looks reasonable. At $9.99 for the 256GB drive a year, it’s hard to argue that’s a bad deal. Having access to any of your files remotely and securely even with your pc off, and your thumb drive in the drawer is a nice selling feature. Do keep in mind that while SanDisk does look like they did a decent job with security, while still being able to provide sharing features, etc - it’s still hosting your data remotely. Be sure to secure your account with a good password. I’d like to see them implement two factor authentication to help bring further peace of mind to those backing up sensitive data and/or financials. The SanDisk Ultra 256GB is a decent performing everyday USB pen drive with a large capacity. The real selling feature of the Ultra series here is the FlashBack service, and it seems to really hit the nail on the head. If you’re looking for a good backup drive that can double as a carbonite or other backup service replacement - this might fit the bill if your needs are simple. In any case, it’s a decent alternative to using Google Drive and offers a ton more storage for the money (and gives you that storage free the first year). This new model of storage actually seems pretty compelling, I highly recommend trying it out.
I would recommend this to a friend - Pros mentioned:Speed, Storage capacity
Rated 5 out of 5 stars
Performs Better Than Advertised
|Posted .SanDisk's headline for this device is: TRANSFER A FULL-LENGTH MOVIE IN LESS THAN 40 SECONDS (which is carefully footnoted: Based on 1.2GB MPEG-4 video transfer with USB 3.0 host device.). That's their way of representing a write speed for single large files - and it's impressive but I was able to get files close to 2 GB transferred over to the drive in under 40 seconds (replicated on two different computers - some tests took a little longer but I was able to repeat the under-40 second write multiple times). They also advertise potential read speeds of up to 100MB/s with a USB 3.0 port. And with the same large MPEG-4 video files I was using to test write speeds, I got consistent read speeds of 145-165 MB/s (with a USB 3.0 port). Naturally read/write speeds for transferring tons of little files are significantly slower but still pretty impressive. I attached two benchmark results below.
I would recommend this to a friend - Pros mentioned:Price, Storage capacity
Rated 4 out of 5 stars
Tons of space at a cheap price.
||Posted .I bought this because I generally run multiple different programs on various computers; I felt like each year I had to double my USB size (32>64>128>256). I have the 128 version of this drive and while I have not ran tests, I can tell you that this one is a bit slower. However, at this price point of $60 I can not argue the extra 20 seconds on an iso file. There is one negative, the text on the usb (IE. Red "Sandisk" writing and the back where you can write your name will fade away after a couple of weeks in a pocket, every version of this thumb drive does this)
I would recommend this to a friend Features
Value5 out of 5Quality5 out of 5Ease of Use5 out of 5Pros mentioned:Price, Storage capacityRated 5 out of 5 stars
Nice
||Posted .Owned for less than 1 week when reviewed.256 gb Flash drive for such a low price... Can't go wrong, Has like a vault, to secure files in also. Works great...
Features
Value5 out of 5Quality5 out of 5Ease of Use5 out of 5I would recommend this to a friend
Q: QuestionSomeone posted on the review for this flash drive that it's safer than a external hard drive. How is that? I've never heard that comment about a flash drive versus hard drive.
Asked by Anonymous.
- A:Answer All hard drives (including external) have moving parts Flash drives on the other hand don't. If any of the moving parts fail the hard drive turns into a paper weight and you lose your data. This is more likely to happen with external hard drives because they get moved around. Think about like using a old portable cd player. If you moved the the player while in use you could end up damaging the the disc: then you could no longer use it. If you shake it the music would skip. Now think about listening to music from your phone. Your cell phone uses flash memory just like this "flash drive" If you started flipping your phone around nothing gets damaged (unless you drop it lol) and the music does not skip. So flash memory including this "flash drive" are safer because they are less prone to failure. at lease that's my opinion.
Answered by Nasser
Q: QuestionCan this be used on a USB 2.0?
Asked by Anonymous.
- A:Answer Yes, this is backward compatible with USB 2.0.
Answered by CommunityAnswer
Q: QuestionWill a Windows 10 (Professional) computer recognize and read from this device?
Asked by ls5065.
- A:Answer Yes, this item is compatible with Windows 10.
Answered by CommunityAnswer
Q: Questionwill I have to download any SanDisk software to properly use & benefit from the SanDisk flash drive on my MacBook Air?
Asked by Price.
- A:Answer Hmm. Forgot to mention it my review, but there was actually some kind of a glitch when I tried to download SanDisk's latest version of the on-drive encryption software, so I just used the SanDisk encryption software that was already on the drive. And eventually I decided not to use it, because, ehh, I just thought it was a little clunky to use and there's gotta be better encryption software out there. But as to any other software requirements: Nope -- at least not for the Windows PC I use, and I doubt it'd be any different for a Mac. Just plugged it into the USB port & started using it.
Answered by Snocrush
Q: QuestionI am trying to transfer some large mpg files to this flash drive. Some files won't transfer because they are"Too large for the destination file system". (eg. a 4.70 GB file) Is there a file size limit that this flash drive will support?
Asked by DaveB.
- A:Answer Fat32 file systems have a single file size limit of 4 Gbs. The flash drive I received was formatted in Fat32. If you want to put a file on there that is bigger than 4 Gbs, you can change the file format for the flash drive to exFAT or NTFS.
Answered by Loomis1975
Q: QuestionUse with Ford "SYNC' systemCan this flash drive be used to plug into Ford "SYNC" system USB port to play back music stored on drive?
Asked by mobman50.
- A:Answer If the music is stored in mp3 format.
Answered by EmmaStone
Q: QuestionI want to store hundreds of photos so if my pc crashes I wont lose any. How many can I store on this 256gb flash drive? And when my old pc does crash (had it 10 yrs), will I be able to use this flash drive on another pc or other device?
Asked by Duggan.
- A:Answer In regards to how many photos you can store on this flash drive the answer is it depends on how big each picture is in size(mega bites). If they are pictures from your phone you can store a lot of them. How many is unknown. If they are pictures in raw format from a canon, nikon, sony etc. camera it also depends, but it would be a lot less pictures than pictures from your phone. In regards if the flash drive can be use in another PC if the PC crashes the answer is yes. That's one of the purposes of having flash drives, portability and be able to use in multiple devices. Usually the flash drives are also pretty reliable you wont loose data with time and last longer than a hard drives. But that doesn't mean that they never fail. If the pictures are really important to you I'll keep 2 back ups of them.
Answered by wildsoldier
Q: QuestionDoes this work in both Mac and PC?
Asked by Mavis.
- A:Answer Yes, this will work on Mac and PC.
Answered by CommunityAnswer