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Old 23-09-16   #1
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Memory Card Speed Anomaly


I ordered a 32GB SanDisk Ultra microSD card from Amazon for a friend and it arrived today. It's the UHS-1 "Up to 80MB/s" version. I immediately tested it with Crystal DiskMark and it gave surprising results. The sequential read test, which should show the highest transfer speed, gave a measly 8.2 MB/s. All other test modes gave reasonable results, e.g., about 19 MB/s sequential write, 2.5 MB/s 4k write, etc. (All figures are rounded off).

I ran the test several times with two different card readers. Then I tested it with HDTune and HDDScan. Then I did some real-world copying of a 1GB file. The read speed stubbornly stayed the same.

I ran the tests on a Win7 machine via a USB 3 port, but with USB 2 card readers, so I expected something like 30-40 MB/s sequential read speed. To check the proper functioning of the USB port, I tested my SanDisk Extreme thumb drive and it gave a normal 200MB/s read and 120MB/s write speeds.

Then I tested a 16GB version of the SanDisk Ultra which I bought a couple of years ago. It also showed the same read speed of about 8MB/s.

Can anybody offer a possible explanation for the dismal read speed?
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Old 17-10-16   #2
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Re: Memory Card Speed Anomaly

format the memory card in NTFS AND SEE IF THAT MAKES ANY DIFFERERENCE
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Old 17-10-16   #3
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Re: Memory Card Speed Anomaly

The USB card reader you are using to test the card may be slow . Use the same card in a phone and test it's speed ether by transferring files via the phones original data cable or , via some Android app on the phone , test the memory card on the phone . Maybe you will get better results . Generally inferior card readers in the market which we buy are the bottleneck . This is purely based on my own experience .

Sent from my HM 1S
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Old 21-10-16   #4
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Re: Memory Card Speed Anomaly

Fix 1 - At times, some of the devices may not read an SD card, therefore, try to connect your SD card to another device.


Fix 2 - Insert the affected card into a card reader and connect it to your system. Click on the "Start" option from your Windows taskbar and then select the "Computer" option. Search for your SD card under "Devices with Removable Storage" and note the drive letter assigned.

Next, click the "Start" option again and type "cmd" in the "search" box. Right-click "cmd" and then select the "Run as administrator" option. A command window opens, and you can fix your corrupt memory card from here.Next, type "chkdsk" followed by the drive letter corresponding to the SD card, then by a colon and /f. After you press "enter", the Chkdsk will check for possible errors and try to fix the corrupt SD card. Follow the subsequent message prompts. Lastly, check your assigned drive letter to your SD card to verify if the files are recovered or not.


Fix 3 - Connect your SD card to a card reader to the system, if your system doesn't assign a new drive letter to it, then it isn't reading it. In some cases, the reader might be assigned a drive letter, but still, you get the message "Please insert the disk into drive E:" indicating that it isn't reading the card. To resolve this problem assign a new drive letter to this connected Card through your operating system settings.


Fix 4 - If none of the files can be read, then possibly the directory will list the filenames, but the files can't be accessed. You can right-click on the drive letter and select "Properties." If you can view the used space on the card and if it shows all or almost all free space, then either all the files have been deleted, or the directory has been erased. In this case, you can use a Sandisk inbuilt solution that might restore all the deleted files easily.


Fix 5 - If you can read all the files but can't save them, then your card might be in write protected mode. Unlock the switch to save or modify files on the card.

If still, you are unable to read or write to the card, then possibly your files are lost or have become inaccessible. To fix it, you need to use a disk diagnostic tool that can work on memory cards too. Although you can also get access to your card by reformatting it, it will remove everything on the card. Therefore, make sure you have recovered all the stored files and copied everything to another drive before SD Card format.

In the case of camera or Smartphone you need to use an SD card Recovery software as most of the files stored on your SD card will be related to photos and other media files. There are some sd card recovery tools available online which are efficient enough to avail you the best and accurate recovery results. You just need to choose the right tool and try to restore your lost, deleted and inaccessible files from the SD card.


Fix 6- Nothing worked?? Yes, Recovery Software is your solution!

Whenever an SD card becomes inaccessible or formatted, then most of the time the stored data gets lost. However, all files remain in the same position on the card and can be recovered by a Photo recovery technology. Stellar Phoenix Photo Recovery Software is specially designed to fetch all the lost photos and other media files from their actual place and make them visible. To restore all lost files from an SD card, make sure the card is not physically damaged. Additionally, stop using the USB drive before card recovery.
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