Pentax K100D Memory Card Compatibility

By Nathaniel Stephan
Last Updated: October 25, 2019
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Olympus SD Memory Card Compatibility

The Pentax K100D is compatible with SD memory cards and has one card slot. SD memory cards with a max storage capacity of 32GB will be compatible with the K100D.

An error code will be displayed if you try to use an SD memory card that has a capacity of 64GB or larger. You will need to purchase more memory cards if you require more storage. The transfer speeds of SD memory cards are the key specs to care about.

If your Pentax K100D will be getting used often. At this time, a UHS-I memory card and a compatible SD card reader are the most efficient way to move photos.

Getting a pro-level card also will help to future proof the card for use in another camera. This will help you avoid a future situation where you cannot use a feature on a device or camera, such as shooting 4k video because the memory card's write speed is too slow.

Here's my recommendation for the best memory card for the Pentax K100D:

SanDisk Extreme Pro UHS-I SDHC Memory Card

SanDisk Extreme Pro 32GB

  • Best SD card available
  • Largest compatible storage capacity.
  • Read speeds of up to 95MB/s.
  • Write speeds of up to 90MB/s.
  • Shock-proof, temperature-proof, waterproof, and x-ray proof.

Best SD Cards

Since the Pentax K100D was launched, memory card prices have gone down and capacities have gotten larger. The difference in price between the fastest SD card and a cheap option is astonishingly little. Price is related to storage, with the largest SD memory cards having a higher price.

Getting the highest capacity cards makes sense if you are going to capture a huge amount of RAW files for action, events, wildlife, or sports photography. Another consideration could be if you intend to replace your camera or use the sd card in a different device.

I think that the SanDisk Extreme Pro line of memory cards are often the best option for most circumstances. They are fast cards which means they have the best shot of being compatible with future digital cameras or devices that also use SD cards.

PNY Elite Performance And Lexar Professional are other cards that I have also had positive experiences with. I have not had files or pictures become corrupted or unrecoverable on these cards. If that scenario did take place, all of them have image recovery software.

Issues I have encountered have been with generic SD cards. Having a low price or being a bundled accessory are the main selling points of these cards. However, this is also the most common kind of card to have an incorrect product description.

It is effortless to put a Class 10 sticker on a Class 4 SD card. When the camera image processor starts writing data there is going to be an error message or corrupted photos if the card's write speed isn't fast enough.

One of the largest controls over cost you have is the card capacity. You will be better off by buying a card with lower capacity to lower cost rather than choosing a cheaper brand. Read and write speeds are important factors that will affect your satisfaction with the Pentax K100D.

Recommended SD Cards

Lexar 633x 23GB UHS-I SDHC Memory Card

Lexar Professional 633X 32GB

  • High-speed, Class 10 performance.
  • UHS-I technology for a read transfer speeds up to 633x (95MB/s).
  • High-speed file transfer from card to computer to dramatically accelerate workflow.

The Lexar Professional is close in performance to the SanDisk Extreme Pro card when used with the Pentax K100D. The most important difference is that the Lexar card features a slower write speed.

Sometimes there can be a difference in price between the Lexar and SanDisk SD cards. I would not pay more for the Lexar, but also would not have a problem purchasing it if it was much more affordable.

SanDisk Ultra UHS-I SDHC Memory Card

SanDisk Ultra 32GB

  • Good value to save some money.
  • Quick transfer read up to 80MB/s.
  • Class 10 rating for Full HD video (1080p).
  • Waterproof, temperature proof, X-ray Proof, magnet-Proof, and shockproof.

The SanDisk Ultra is a lower tier than the Extreme Pro in terms of specificatos. The benefit from that is that it is less expensive.

You will not see a difference in time savings except if you need to write large amounts of data onto the memory card. This is not the most desirable selection if you plan to use the card to record 4k video at some point.

SanDisk Extreme Pro UHS-I SDHC Memory Card

SanDisk Extreme Pro 32GB

  • Read speeds of up to 95MB/s; write speeds of up to 90MB/s.
  • Shock-proof, temperature-proof, waterproof, and x-ray proof.

Memory Card Reader

UGreen 4-in-1 Card Reader
There's a bright blue LED that bothered me. It is now covered in gaff tape.

The UGreen 4-in-1 memory card reader supports four common types of memory cards. These include everything camera manufacturers make use of in all but their newest professional-level cameras.

The UGREEN memory card reader connects over USB 3.0. The USB 3.0 transfer speeds will be faster transfer speeds than what the Pentax K100D can reach transferring files with the USB mode.

There are lots of positive customer reviews for the UGREEN reader, which I agree with. It is a good product because it has been recognized by all the computers (Windows, Mac, and Linux) I have plugged it into.

The cable prevents memory card slots from getting in the way of other devices or accessories that are plugged into another USB or nearby port.

When I looked for a smaller card reader that would be easier to travel with, I had to send a couple of orders back. I came across the most commonly seen problem in customer reviews, the memory card readers did not work with my computer.

The UGREEN reader supports the following card types:

  • CompactFlash Cards
  • SD, SDHC, & SDXC Cards (UHS-I supported)
  • Memory Stick (MS), MS Pro, MS PRO-HG, & MS XC DUO
  • MicroSD, Micro SDHC, & Micro SDXC Cards

Pentax K100D SD Card Compatibility

You can only use SD and SDHC memory cards with the Pentax K100D. Check to be sure that your camera has the most recent firmware installed.

SDXC or SDUC memory cards are unable to be used in the K100D.

Four different types of Secure Digital (SD) cards exist that you need to be aware of. SD memory cards can be identified based on the card's capacity.

  • Secure Digital (SD) - 128MB to 2GB.
  • Secure Digital High Capacity (SDHC) - 4GB to 32GB.
  • Secure Digital eXtended Capacity (SDXC) - 64GB to 2TB.
  • Secure Digital Ultra Capacity (SDUC) - 4TB to 128TB.

Image Capacity

Olympus SD Memory Card Contacts

Image quality settings on the Pentax K100D will effect the number of images that can be stored. Higher image quality options will result in bigger image sizes.

If you are looking to shoot a large number of RAW files, it can make sense to get a larger capacity card.

If you shoot JPEGs, you'd likely be much better off investing in an extra camera battery in place of a bigger card. 32GB would be more than enough space to store a few days worth of pictures.

In fact, the limiting factor to just how many photos you can take will likely be your camera batteries. Keep in mind that, any time the camera is powered on, even if you are just going through menu settings or using the live view, that will still reduce the battery life.

In low light conditions, like indoors or at night, the flash built-in to the camera can be handy. Without the flash, shutter speeds will not be fast enough to prevent motion blur. Utilizing the flash will fairly quickly deplete the camera batteries.

The following is an approximation of the number of high-quality JPG images you can store on a memory card for the listed capacity:

  • 4GB - 1,160 images
  • 8GB - 2,320 images
  • 16GB - 4,640 images
  • 32GB - 9,280 images

Speed, Class, & UHS Ratings

Card Speed

The speed rating of an SD memory card is determined by the sequential read and write speeds. SD card file write speed is important for video as well as continuous shooting.

A slow card can reduce the number of continuous images the Pentax K100D can take. This is because the buffer in the camera is not able to write to the card quickly enough.

With video, a slow SD card can cause recording to stop. The video file could also be corrupted. If you intend to shoot video, it is critical the card you use meets the required continuous write speed for video.

Card read speed is nice to have for file transfers to a computer or laptop. If you are filling up cards with images or video, a card with a fast read speed will save you time.

Speed Class Rating

Example of where to find SD Card Speed Class
The 10 inside of the C means the card is Class 10.

The Class rating of a card is based on the sustained write speed. Memory cards that have a write speed of at least 10MB/s are labeled as Class 10.

  • Class 2 - 2MB/s
  • Class 4 - 4MB/s
  • Class 6 - 6MB/s
  • Class 8 - 8MB/s
  • Class 10 - 10MB/s or faster

Every name brand memory card that you can buy online will be rated Class 10. To determine the class rating of a card, find a number inside of a C on the label.

Ultra High Speed (UHS)

Example of an SD memory card with a UHS-I rating.
The UHS rating of a card can be determined by a Roman numeral I, II, or III on the label of the card.

The Ultra High Speed (UHS) bus is found in SDHC, SDXC, and SDUC cards. The UHS bus memory cards to achieve faster transfer rates.

Three different specifications exist. They are UHS-I, UHS-II, and UHS-III.

Look at the front of the SD card to find the UHS rating of an SD card. If the SD card has UHS, a Roman numeral I, II, or III can be found on the front of the SD memory card.

  • UHS-I - Maximum transfer rate of 104 MB/s
  • UHS-II - Maximum transfer rate of 312 MB/s
  • UHS-III - Maximum transfer rate of 624 MB/s

Related Cameras

Taking the details into consideration, SanDisk 32GB Extreme Pro is the best Pentax K100D memory card. You are now also prepared for any future camera you own.

Here are a few more pages on cameras similar to the K100D:

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