Pentax K100DS Memory Card Compatibility

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

The Pentax K100DS has only one card slot that supports SD cards. It can work with cards up to 32GB in size.

Using an SD card that is 64GB or larger will cause the Pentax K100DS to display an error code. For more storage, you will need to buy additional SD memory cards. The key specs to care about should be the transfer speeds the SD memory card is capable of.

If your camera will be getting lots of use. A feature that is nice to have is UHS-I as it enables faster transfer speeds with a compatible card reader.

Getting a professional level card also will help to future proof the SD card for use in another device. This will help avoid a future situation where you are not able to use a feature on a device, such as shooting 4k video, due to the fact the card's write speed is not fast enough.

Here is my recommendation for the best memory card for the Pentax K100DS:

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 introduction of the Pentax K100DS, memory card prices have fallen and capacities have gotten massive. The price difference between the the SD card that has the fastest transfer rate and a mediocre one is surprisingly small. Price is more closely related to storage size, with the largest SD cards being higher priced.

Purchasing the highest capacity cards is a good idea if you're going to capture a large amount of RAW files for wildlife, sports, events, or action photography. Another reason could be if you intend to replace your camera or use the card in other devices.

The SanDisk Extreme Pro line of cards are usually the best option for most cameras. They are fast cards which means they have the best shot of being compatible with future digital cameras or devices that use SD cards.

I have had positive experiences with Lexar Professional and PNY Elite Performance cards. I have not had files or data become inaccessible or unrecoverable on these brands. If that scenario did take place, all of them have image recovery software.

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

It is effortless to put a Class 10 sticker on a card with a Class 4 rating. When the camera image processor starts writing data there is bound to be an error message or corrupted images if the card's write speed does not meet the requirements.

One of the biggest controls over price you have is the storage capacity of a card. You'll be better off by going one step down in capacity to lower cost as opposed to choosing a relabeled brand. Read and write speeds are important factors that will impact your satisfaction with the Pentax K100DS.

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 comes close to matching the performance to the SanDisk Extreme Pro card when used in the Pentax K100DS. The only difference is that the Lexar memory card has a slower write speed.

Sometimes there can be a big difference in cost between the Lexar and SanDisk memory cards. I would not spend more for the Lexar, but also would not have a problem purchasing it to save money.

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 step down from the Extreme Pro with respect to performance. The benefit from that is that it costs less.

You will not detect a impact in performance except if you need to write a large number of files onto the card. It's not the most desirable option if you plan to use the memory card to shoot 4k video one day.

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 is compatible with four memory card formats. These cover everything camera manufacturers implement in all but the newest professional-level cameras.

The UGREEN memory card reader connects over USB 3.0. The card reader's USB 3.0 transfer speeds will be faster transfer speeds than what the Pentax K100DS is capable of in USB transfer mode.

There are overwhelmingly positive customer reviews for the UGREEN reader, which I agree with. I think it is a good product because the reader has worked with all the computers (Windows, Mac, and Linux) I have plugged it into.

The cable prevents memory card slots from interfering with other devices or accessories that are plugged in.

When I searched for a smaller card reader that would be better for travel, I needed to send a couple of orders back. I came across the most frequent problem in customer reviews, the card readers were not recognized by my computer.

The card reader is compatible with the following memory card formats:

  • 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 K100DS SD Card Compatibility

Only SDHC and SD memory cards can be used by the Pentax K100DS. Check to make sure that your camera has the most up to date firmware.

SDUC or SDXC memory cards can't be used with the K100DS.

You need to know of the 4 types of Secure Digital (SD) cards that can be bought. They are divided by size.

  • 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 K100DS will determine the number of images that can be stored. Higher image quality settings will result in larger image sizes.

If you're planning to shoot lots of RAW files, getting a card with a larger capacity can be worth the money.

If you shoot JPEGs, you would be much better off purchasing an extra camera battery instead of a bigger card. A card with only 32GB of capacity will have ample room for days of images that would need batteries to be recharged multiple times.

The controlling factor to how many pictures you can capture will likely be your camera batteries. Take into account that, any time the Pentax K100DS is powered on, even if you are just navigating through menu settings or using the live view, that will eat away at battery life.

For low light settings, like at night or indoors, the flash built-in to the camera can be helpful. Without using the flash, shutter speeds won't be fast enough to avoid motion blur. Working with the built-in flash will fairly quickly drain the camera batteries. These situations are when you'll need to own at the very least a couple of BATMODEL rechargeable batteries.

The following is an approximation of the number of high-quality JPG images you will be able to store on a SD memory card for the listed storage size:

  • 32GB - 9,280
  • 64GB - 18,560
  • 128GB - 37,120
  • 256GB - 74,240

Speed, Class, & UHS Ratings

Card Speed

The speed rating of an SD memory card is dependant on the sequential read and write speeds. Card continuous write speed is important for video as well as continuous shooting.

A slow memory card can cause a reduction in the number of continuous images the Pentax K100DS can take. This is due to the camera's buffer not being able to write to the SD card fast enough.

With video, a slow SD card can cause a sudden end to the recording. The video file may also end up being corrupted. If you intend to capture video, it is critical the SD card you use meets the required continuous write speed for video.

Card read speed is important for transferring files to a computer or laptop. If you have cards that are full, an SD card with a fast read speed will reduce the time it takes the transfer to complete.

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 related to the sustained write speed. Memory cards that have a write speed of at least 10MB/s will be rated 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 card that you can find for sale will have a Class 10 rating. To check the class rating of an SD card, try to 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 SDUC, SDXC, and SDHC cards. UHS cards to have faster read and write speeds.

Three separate specs exist. They are UHS-I, UHS-II, and UHS-III.

To find the rating of a memory card, look at the label. The presence of a Roman numeral I, II, or III on the front of the SD memory card, that is the UHS rating of your 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

If you could only choose one, SanDisk 32GB Extreme Pro is the best Pentax K100DS memory card. You are now also prepared for any future camera you own.

Listed below are more posts on Pentax cameras related to the K100DS:

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