Frequently Asked Questions

Can I use an SDXC memory card with an SDHC host device?

SDXC host devices can use and support SD, SDHC and SDXC memory cards.

SDHC host devices can use and support both SD and SDHC memory cards.

SDHC memory cards can be used with SDHC and SDXC host devices.

How do I format my SD cards?

It is strongly recommended to use the SD Formatter instead of formatting utilities provided by operating systems that format various types of storage media.

Try downloading “SD Formatter 3.1 for SD/SDHC/SDXC” at:

If you have already formatted the card then you won’t be able to retrieve the photos.


How much capacity of flash card do I need to take pictures?

You can choose a suitable flash card by the resolution of your camera and the number of photos you want to take. You can take the reference as below:


*The file size of the above table is calculated by using camera’s high resolution JPEG mode. The actual number of images per flash card will depends on the resolution setting of the camera and exposure values of different scenes.


*The file size of the above table is calculated by using camera’s high resolution JPEG mode. The actual number of images per flash card will depends on the resolution setting of the camera and exposure values of different scenes.

I bought an 8GB memory card but it only shows 2GB?

1. This could be caused by the file system. The FAT format only supports up to 2GB. Please format your memory card as FAT32.

2. If the file system is FAT32 and the capacity still 2GB, you have to delete the partition. Please follow the steps to fix:

Control Panel          System Admin Tools           Disk Management       Delete Partition           Format

3. If you bought your memory from an online marketplace and does not show any brand logo, manufacturer’s information and the likes, it is likely that the memory card is fake.

I keep receiving “card error” message whenever I turn on my camera with the flash cards in. I’ve removed the card several times and put it back in but I still get the “card error”. According to the camera’s instruction manual, I might need to format the flash card if this occurs. How do I do that?

It is true that the format on the card may be corrupted. This will happen if:

• The card was removed from the camera before the camera is finished writing to the card

• The camera was turned off before it is finished writing to the card

• The camera’s batteries run dead

• The batteries are running low (especially if you are taking rapid photos)

• The incorrect batteries are used in the camera. (See the camera user guide or manual for more info on batteries)


Format the card using the camera’s formatting utility if possible. Since the format on the camera is not always sufficient to correct this, the card can also be formatted in PC (a USB Card Reader might be required). Just format the card like you would a floppy Disk. In My Computer, right click on the drive letter for the card and select Format.


WARNING: Formatting your card will erase all data on the card.

I placed pictures in my Flash Memory Card but I can’t see them in my digital camera.

CAUSE – You have modified the pictures or you have placed them in a folder other than the one the camera uses.


SOLUTION – If you have modified the pictures, most cameras will no longer be able to see the pictures. In the future do not modify the pictures if you need to see them again with the camera. If you placed them in the wrong folder, please put them in the folder you originally found them in. Most cameras will only use the folder they create to see the pictures.

What are important factors for you when buying memory?

1. The capacity of memory based on your requirements/purposes

2. The compatibility of memory for your devices

3. The cost of memory vs. budget

4. The speed of memory

What is flash memory card? Why it is a good choice for storing images, music and data?

Flash cards are solid state, meaning they contain no moving parts, and provide users with greater protection of their data than conventional magnetic Disk drives. It can be re-used again and again by simply erasing old images or data and re-use the flash card. It is not only convenient, but also cost-effective. Currently there are eight different kinds of flash memory cards available on the market, these are: Secure Digital, SDHC, MiniSD card, MicroSD card, Compact Flash, MMC Mobile, MMC Plus, xD Picture card, Memory Stick Pro Duo and M2.

What is SDHC? Does SDHC compatibility with my device?

An extension of the SD standard, SDHC (Secure Digital High Capacity, SD 2.0), allows capacities in excess of 2 GB. SDHC Host Products can use both SD and SDHC Memory Cards. SD Host Products can use only SD Memory Card 2GB or less.







What is the Class Speed Rating in SDHC cards?

The SD Association defines 3 speed classes to help users identify the speed and performance of SDHC cards. The class speed rating specifies a minimum sustained write speed (Class 2: 2 MB/s; Class 4: 4 MB/s; Class 6:6 MB/s). You can look for the Speed Class Logo to identify the performance class of your memory cards and host devices.


For more information about class speed rating, please refer to:


What is the difference between SecureDigital and MMCplus cards?

They are different technologies and devices that use the MMCplus Card may not be able to use the SecureDigital Card, Please refer to the device manufacturer to confirm compatibility before purchasing.

What is the difference between Speed Class and Speed Ratings for SDTM/SDHCTM cards?

RATED SPEED (e.g. 15MB/s, 30MB/s, etc.) is maximum speed of the card and also what you would expect to approximately see in typical usage of writing or reading files on the card.

SPEED CLASS is a minimum speed based on a worst case scenario test. The Speed Class is important for video mode or camcorders, where the device is actually saving a steady stream of data. This translates to a minimum speed you need to guarantee that the video captured on the cards is recorded at an even, sustained rate with no dropped frames (which typically results in lost data and choppy playback).

What is the difference between TransFlash ( T-Flash ) and microSD cards?

MicroSD is a format for removable flash memory cards. It is derived from SanDisk® TransFlash and is used mainly in mobile telephones, but also in handheld GPS devices, portable audio players, video game consoles and expandable USB flash memory drives. TransFlash and MicroSD cards are the same (each can be used in devices made for the other).

Why are my Flash Memory Card nor my pictures and files inaccessible?

Below are several factors as to why:

1. Taking pictures too fast so the camera cannot finish writing them before the next one is taken.

2. Turning off the camera while it is still saving information.

3. Removing the card while the camera is still saving data to it.

4. Taking pictures with weak batteries.

5. Large static charges to the card.

6. Airport x-ray machines (we recommend carrying cards in your hand-carry luggage).

7. Removing the card from the reader while you have files that are on the card open.

8. Removing the card from the reader while it is still copying files to the hard drive.

Why can’t my digital camera use a higher capacity flash card?

Please contact your digital camera manufacturer to verify its maximum supported.

Why does my memory card cannot be accessed by my camera?

Please try to format your memory card by your camera. If it still doesn’t work. There may be the following reason:

1. The camera doesn’t support the high capacity memory card

2. The compatibility issue – you are welcome to e-mail us before buy our products or take your device to the store to test it.

3. If this happens after a while, it could be a memory failure.

Why is the capacity printed on the label of the card different from the one indicated by Windows?

1. The unit of capacity. When card manufacturers say “MByte”, “M” means “Mega” which is equivalent to million (=106). Windows or other Operating Systems define “M” as 1024 times 1024 (=220). According to the fact, 256MByte is equal to 256000000 Byte as a definition of card manufactures, which is equivalent to 244MByte as a definition of Windows.

2. The second one is related to the card itself. In general, memories on a card are consumed by not only the users but also by the card itself. For example a card needs management area or spare area. In addition, DOS (Windows) format needs some area even though it is very small.


While some price fluctuation can be attributed to cover materials and other such accoutrements, quality is almost entirely dictated by density of the foam. The heavier and firmer to the touch a product is, the denser it is. At UNIREX MEMORY, quality and you, the consumer, are on top of our priorities.

What do you get when you forgo the clout of brand names and go for a UNIREX Memory Class 10 Card? For one, you’ll pay about half as much per GB. The card will also get you write speeds up to 15 Mbps.