Top SD Card Questions

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The SDHC Specifications sets a minimum guaranteed speed of 2, 4, 6 or 10MB/s to match a host device. This speed rating is commonly referred to as Class 2, Class 4, Class 6 and Class 10 speed.

This rating system was introduced to satisfy the needs of High Definition digital cameras and camcorders, where a guaranteed continuous write speed is more important than the maximum write speed which is affected by many variables.

When using a camera there are some housekeeping rules that can help speed:

  • Format the card in the host device (after backing up files)
  • Do not try and fill the card to the maximum - as the card gets full it can slow down as the controller needs to find empty space on the card
  • If your device asks for a minimum Class 4 memory card use Class 4 or above and you should not encounter any problems
  • If the device requires a Class 6 card you can use a Class 6 or a Class 10 card in most cases.
  • If the device requires a Class 10 card - You should use a Class 10 card to enjoy the best performance.

"UHS-1" or more accurately "UHS-I"  stands for "Ultra High Speed" - 1 and is a speed class for SDHC and SXDC memory cards.

UHS-I has a bus interface speed of up to 104 MB/s.

An SDHC UHS-I card will work in any SDHC compatible device at lower speeds, but to take advantage of the UHS-I speed, a UHS-I compatible device is essential.

An SDXC UHS-I card will work in any SDXC compatible device at lower speeds, but to take advantage of the UHS-I speed, a UHS-I compatible device is essential.

UHS-I compatible cards and devices are normally marked with the symbol below ,"UHS-I" or "I"

A speed class is also defined.

 = Class 1 ."UHS Class 1"  


This is the SDHC UHS-I Class 1 logo.


This is the SDXC UHS-I Class 1 logo.


Integral offer a wide selection of SDHC and SDXC cards with a UHS-I U1 and UHS-I U3 interface.

UHS-II interface cards are now also available from Integral for the very latest digital cameras.



There can be a various causes to this problem. Follow the steps below to try and solve the issue:

  • Firstly ensure you are plugging the USB Flash Drive directly into the PC or notebook and ensure you have the latest USB drivers for your operating system
  • Try plugging your USB Flash Drive into another USB port on your PC/notebook. You could test the USB on another PC or notebook if available
  • Keep your USB Flash Drive plugged in and perform a full ‘Windows Update' to check for any missing or newer drivers for your computer. To do this, open Internet Explorer and click Tools> Windows Update and follow the onscreen instructions

If you are still experiencing problems, please fill in the tech support form and we will help with your issue.

This means that your PC or laptop has a USB 1.1 port and will not function at the high speed offered by USB 2.0 devices.

This is not a error message and your Integral USB Flash Drive is backwards compatible to work at the slower speeds of USB 1.1. To get the full functionality of the USB 2.0 Flash Drive you will need a PC or laptop with USB 2.0 sockets.

The chart below represents the three tiers of the USB Series:

USB Version / Descriptive Term / Transmission Speed

USB1.0 / Low Speed / 1.5 Mbps
USB1.1 / Full Speed / 12 Mbps
USB2.0 / High Speed / 360 ~ 480 Mbps
USB3.0 / Super Speed / 4.8Gbps



This is due to the USB Flash Drive being removed from the computer without safely exiting the drive. Your data may be corrupted.

In order to prevent this error, you will need to do make sure that all files that you had opened on your computer (that are stored on your USB) are closed.

PCs running Windows XP and above and Macs with OS 9 and above have a "safely remove USB" option that we recommend you follow:

Windows 2000/XP/Vista/7

Locate and left click on the "Safely Remove" icon on the System Tray to display the USB devices connected on your PC/notebook. Select the computer drive letter assigned to your USB and click on the "close/unplug" option, so you can safely remove it.

Apple Mac OS 9 and above

Locate the USB drive icon on the desktop and drag it onto the Apple Trash can (icon).


No. Data is not stored in DRAM memory once the computer is turned off. All data is stored on your hard drive (HDD) or Solid State Drive (SSD).

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