There are a number of common issues experienced with SanDisk memory cards and flash drives. We have categorized the usual problems on SanDisk USB flash drives, pen drives, micro SD cards, SDHC cards, and SDXC cards, into two groups corresponding to their solution. These problems can all be solved by either formatting the disk or manually repairing the device from the registry editor. Check which category your problem falls into, then follow the respective guide to get your SanDisk device working again.
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Category 1
SanDisk SD card not showing the full capacity.
SanDisk Cruzer 16GB not recognized by camera or phone.
Windows unable to complete the format for a SanDisk removable disk.
Category 2
SanDisk write-protected error in Windows: can't write anything.
SanDisk flash drive is corrupt, inaccessible, unreadable, damaged, or has bad sectors.
Category 1 Solution: Format the Disk
When facing SanDisk problems similar to the listed entries in the first category, go ahead and download EaseUS Partition Master, the most recommended SanDisk format tool, for a quick fix. Go to EaseUS’s free partition manager page to learn more details about the software.
Guide: Format a Sandisk drive in Windows operating system
Step 1: Launch EaseUS Partition Master, right-click the partition on your external hard drive/USB/SD card which you want to format and choose the 'Format' option.
Step 2: Assign a new partition label, file system (NTFS/FAT32/EXT2/EXT3), and cluster size to the selected partition, then click 'OK'.
Step 3: In the Warning window, click 'OK' to continue.
Step 4: Click the 'Execute Operation' button in the top-left corner to review the changes, then click 'Apply' to start formatting your external hard drive/USB/SD card.
Category 2 Solution: Fix Write Protection and Corruption Errors via Regedit/Registry
For the situations in the second category, simply formatting the disk will likely not be sufficient. Instead, it will require some manual editing of the Registry.
1. Repair a Write-protected SanDisk SD Card or Flash Drive
If it's about removing the write protection on a micro SD card, there are three ideas to fix a write-protected SD card, including unlocking the lock switch, toggling the loss lock switch, and changing the lock feature in the mobile device settings.
Since a USB flash drive doesn't have a lock switch, you can only try to fix a write-protected USB drive by deleting its associated registry files. This allows the device to be reinstalled by your computer, which will lift the write protection setting. The method to get this done will be laid out in #2, as it will also solve when a computer does not detect the device at all.
2. Repair SanDisk Device Not Detected by a Windows PC
The official SanDisk knowledgebase states that a corrupt registry entry can cause your SanDisk product to not be detected by the computer. Removing the registry keys created upon installation of your SanDisk product will allow the computer to fully reinstall the device and may resolve the issue..
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Step 1. Back up the registry
1. Unplug the device from the USB port. 2. Run regedit.
Windows XP: Go to 'Start' > 'Run', type in regedit and then click 'OK'. Windows 7, 8 and Vista: Click the Start button, type regedit in the search box, and then press Enter. Window 10: Type regedit, in the 'Search the web and Windows' field (lower-right) and then select 'Regedit - Run Command'.
3. From the registry menu, choose File > Export. 4. Name the file SNDK.reg and save it to your desktop.
If you experience any issues after editing the registry, you can restore this backup by following steps 1 through 3, but choosing File > Import instead. Choose the SNDK.reg file that you backed up, allow it to import, then restart your PC.
Step 2. Remove SanDisk info from the registry
WARNING: DO NOT delete any registry keys other than keys that include VID_0781, the SanDisk device’s keys. Deleting important registry keys can result in booting issues and other system malfunctions.
1. From the registry menu, click 'Edit' and choose 'Find'. 2. Type in VID_0781 and click 'Find' Next. 3. Once the search finishes, right-click the highlighted registry key and select 'delete'. 4. Press the F3 key to find the next registry key that includes VID_0781. 5. Right-click the highlighted registry key and select 'delete'. 6. Repeat this process until the search returns with No results Found.
NOTE: Under Windows 7, 8 and Vista, some registry keys may be protected and cannot be deleted. Simply skip over these keys if you receive a message that the key cannot be deleted.
7. Once all registry keys containing VID_0781 have been deleted, reboot your computer. 8. Plug the device into the computer after it's finished rebooting. The device will be reinstalled.
If you have trouble completing this process, there is another way that you can try to fix a USB flash drive not showing up in another way.
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Buying the best USB flash drives for your needs is an essential purchase, no matter how you're using your hardware, and we're here to help.
In this list of the best USB memory sticks, we look at portable USB flash drives that offer you safe and secure portable storage for your important files.
The best USB flash drives don't just offer you a quick and convenient way to transfer data from one PC to another. The brilliant memory sticks in this guide are versatile devices that offer plenty of storage space despite their small size. The best USB flash drives are also sturdily built, so they won't get damaged when you're carrying them about. The best USB memory sticks and flash drives also need to be dependable, so they don’t fail or break, making your data vanish into thin air. This means the best flash drives feature a strong build design.
Speed is also a major factor. Not only will the best flash drives transfer files faster with a high speed rating, but it will also make running a ‘live CD’ operating system from the flash drive possible.
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To help you choose which USB storage is right for you, we assembled this list of the best USB flash drives you can buy today.
If USB drives are either too expensive (for the amount of storage you’re planning to use) or their capacities are just not high enough (or you tend to lose them a lot), feel free to check out our list of the best external hard drives.
1. Patriot Supersonic Rage 2 USB flash drive
Capacity: 128GB | Interface: USB 3.0
Extremely fast
Expensive
If you want one of the fastest possible USB memory sticks, then the Patriot Supersonic Rage 2 is definitely the one for you. Sure, the price is high, but we were blown away with how fast the device is. If you need to move around large files quickly, then this is definitely worth the price.
It also comes with 128GB of storage space, which is a phenomenal amount of storage to carry around in your pocket. Just make sure you don't lose it!
2. Kingston Technology DataTraveler 100 Generation 3 USB flash drive
Capacity: 64GB | Interface: USB 3.0
Good value
Not as fast as other USB 3.0 flash drives
Over the past two years or so, the rise in wholesale transportation costs has made it uneconomical for retailers to sell USB flash drives that were too small, with the cost of postage and packaging actually constituting the biggest portion of the selling price.
The Kingston Technology DataTraveler 100 Generation 3 is the most affordable 64GB USB 3.0 drive on the market with read/write speeds of 150Mbps and 70Mbps respectively.
3. SanDisk Extreme CZ80 USB flash drive
Capacity: 32GB | Interface: USB 3.0
Cheap
Not quite the fastest stick out there
The SanDisk Extreme CZ80 is a brilliantly priced USB drive that offers plenty of storage space and file transfer speeds. Although it's priced more towards the budget end of USB sticks, the performance is anything but budget - this is a very speedy little performer.
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The slide-out design of this stick means you can tuck the USB interface into the body when not in use, minimising the risk of it getting damaged while you're carrying it around.
4. Verbatim Pinstripe USB flash drive
Capacity: 128GB | Interface: USB 3.0
High capacity
Not the most robust drive
This is the cheapest USB 3.0 drive on the market on a per-GB. It comes with a two-year warranty and a capless/retractable cap design.
Worth nothing that Verbatim - a very well known Japanese storage and memory manufacturer - sells it on its website and usually has pretty good deals on the device.
5. PNY Turbo 256GB USB flash drive
Best 256GB USB drive
Capacity: 256GB | Interface: USB 3.0
Good speeds
Another memory vendor that turned into a player in the USB market as well. which features a capped design as well as read/write speeds of 80Mbps and 20Mbps respectively.
These are not super fast speeds and if you want something with more oomph then check out some of the other USB drives in this roundup.
6. Patriot Supersonic Mega USB flash drive
Best 512GB USB drive
Capacity: 512GB | Interface: USB 3.1
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Solid build quality
Expensive compared to competition
A USB 3.1 drive (compatible with USB 3.0 and 2.0) from one of the most established memory players on the market but a relative newcomer to this segment.
It has a zinc alloy body with aluminium accent and reaches read/write speeds of 380Mbps and 70Mbps respectively. No slouch and one that comes with a five-year warranty.
7. Samsung T3 SSD USB flash drive
Capacity: 1TB | Interface: USB 3.1
Very good performance
Expensive
We're solidly in premium territory with this model; not only does it offer absurdly high read speeds of up to 450Mbps thanks to Samsung's own 3D V-NAND technology, it also comes with a three-year warranty and has a USB Type C connector. Note that it is much bigger than a traditional flash drive and costs about five times a spinning hard drive of a similar capacity.
In comparison, a 1TB SSD like the Samsung EVO 850 costs just £240. It comes with V-NAND based like the Samsung Portable T1 and it does boast speeds of 530Mbps and 520Mbps in read/write mode respectively. Note that you will need to get a separate enclosure to get it to work with a standard USB port.
8. SanDisk Ultra Fit CZ43 USB flash drive
Capacity: 32GB | Interface: USB 3.0
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Compact and portable
Not very fast
If you don't want a USB stick jutting out of your laptop or tablet while you use it, then a low profile USB stick is a good choice, and the SanDisk Ultra Fit CZ43 is an excellent choice. It's small and light enough to easy carry around, and when it's plugged into your laptop it doesn't stick out much from the body.
It's also very cheap, at around £10 for the 32GB version, with 64GB and 128GB versions also available. It's not quite as fast as many of the other USB memory sticks we mention here, but if you want a small form factor USB stick, it's worth the trade-off.
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How to choose your USB memory sticks?
It's not worth looking for memory sticks with capacities smaller than 64GB simply because the price premium you pay for twice or four times the storage is tiny.
Make sure you include delivery price when doing the numbers as quite often you end up paying more for the postage than the drive itself, particularly for low cost models.
USB 2.0 is sufficient for smaller capacities but not for bigger ones where write speeds can be sluggish. Larger flash drives (128GB or more) often come only with a USB 3.0 connector.
If you plan to move files to and from portable devices (tablets or smartphones), consider a memory stick with a microUSB connector and a full size USB one.
Avoid buying your memory sticks from vendors with few feedbacks on auction websites as these drives might turn out to be fake. All the vendors listed below are tried and trusted ones.
Above 128GB, you might want to consider a SSD if you want ruggedness, portability, versatility and better performance without the cost.
Note that all the capacities are likely to be much less than stated when they are formatted and when mounted on an operating system.