Memory Cards – A Purchasing Guide for Businesses and IT Resellers
Memory cards are one of the key components of IT infrastructure in business environments – from video surveillance systems to mobile devices and industrial cameras, all the way to edge servers and computerized production equipment.
When choosing a memory card, important information includes type, size, capacity, write and read speed, and resistance to external factors. Memory cards are used to store and save data such as files, photos, videos, or music in various devices – from smartphones and tablets to dash cams. Before purchasing, it is worth checking the card's compatibility with the device and whether it supports a specific standard, e.g., SDHC or SDXC, to avoid operational issues. The durable construction of cards is particularly important when working in harsh conditions, such as in dash cams or industrial devices. On senetic.pl, you will find a wide range of memory cards from reputable brands. The following guide will help you select the right product for a specific application.
What is a memory card and what is it used for?
A memory card is a compact data storage medium based on flash technology (non-volatile memory that stores data without power). Memory cards are used for saving data and storing files such as photos, videos, music, or documents, making them a universal solution for many applications. In a B2B environment, memory cards serve multiple functions: they provide local storage in IP cameras and CCTV systems, expand the capacity of mobile devices used by field workers, serve as boot media for embedded systems and mini-computers, and enable fast data transfer between devices.
The most important format is SD (Secure Digital) and its variants – microSD (miniature, used in phones, smartphones, tablets, action cameras, label printers), SDHC (High Capacity, up to 32 GB) and SDXC (eXtended Capacity, from 32 GB to 2 TB). For modern smartphones, high-capacity microSDXC cards, e.g., 128 GB or 256 GB, and high transfer speeds are recommended, which is important for storing photos, videos, and applications. In professional and industrial applications, CFexpress and CompactFlash (CF) cards are also encountered, offering extreme performance for 4K/8K video cameras and studio cameras.
Types of Memory Cards
- MicroSD / microSDHC / microSDXC – most commonly used in IP surveillance cameras, company phones, mobile terminals, label printers, and IoT devices. Available in various sizes and capacities from 8 GB to 1 TB. For cameras recording in 4K quality, it is recommended to choose SDXC or microSDXC cards with high write speeds, preferably with UHS-II class, to ensure stable recording without image stuttering. Different types of memory cards vary in size, capacity, and speed, so it is worth checking which card will be suitable for a given device.
- SD / SDHC / SDXC – standard type of memory cards in full-size format, used in cameras, camcorders, recording devices, and audio-video equipment. SDXC cards are a type of high-capacity card, ideal for storing high-resolution photos and videos. SDXC and SDHC are most often chosen for cameras due to their transfer speed and capacity, allowing for seamless storage of large RAW files and high-resolution videos. A popular choice in marketing, content production, and service documentation departments.
- Industrial and High Endurance Cards – cards designed for continuous 24/7 operation, e.g., in recording systems with surveillance cameras. Certified for extreme temperature ranges (from -25°C to +85°C), the right choice for industrial facilities, warehouses, and outdoor installations.
- CFexpress Type A / Type B – next-generation cards based on the NVMe/PCIe protocol, intended for professional cameras and mirrorless cameras. They offer read speeds above 1000 MB/s and write speeds above 700 MB/s.
- CompactFlash (CF) – an older but still used type of memory card in specialized photographic equipment and some industrial devices. Mechanically durable and resistant to damage.
Basic Technical Parameters of Memory Cards
- Capacity (GB/TB) – determines the amount of data that can be saved. For example, 128 GB of memory allows for storing about 1600 RAW photos or 120 minutes of 4K video, while 256 GB allows for about 3200 RAW photos or 250 minutes of video. In CCTV systems, typical capacities are 32–256 GB (loop recording). In company phones and tablets, a popular range is 64–256 GB.
- Read / Write Speed (MB/s) – a key parameter for applications requiring fast transfer. Write speed is particularly important when recording 4K video and taking rapid burst shots. Higher write speeds mean smooth 4K video recording, which is essential for modern digital cameras and dash cams. It is worth paying attention to actual sequential and random speeds (IOPS).
- Speed Class (Class 10, U1, U3, V30, V60, V90) – designations inform about the minimum continuous write speed. Class 10 cards are among the most popular and provide sufficient speed for modern digital cameras and dash cams, allowing for Full HD video recording. U3/V30 (min. 30 MB/s) is required for 4K, while for professional applications, such as high-resolution recording, cards with V60 or V90 class are recommended.
- UHS Standard (UHS-I / UHS-II / UHS-III) – determines the maximum data bus bandwidth. UHS-I cards offer higher write and read speeds than Class 10 cards, which is important when working with 4K video. UHS-I up to ~104 MB/s, UHS-II up to ~312 MB/s, UHS-III up to ~624 MB/s. UHS-I and UHS-II differ in speed – UHS-II has an additional row of pins, which translates to even higher performance. A higher standard requires device compatibility.
- Application Class (A1, A2) – important for cards used in mobile devices or embedded systems. A1 and A2 cards are optimized for application performance on smartphones, offering faster random read and write speeds. A2 provides min. 4000 IOPS read and 2000 IOPS write, translating to smooth operation of applications launched from the card.
- Durability and Certifications (TBW) – industrial cards have certifications for resistance to moisture, shocks, X-ray radiation, and temperature ranges. It is worth paying attention to the cards' resistance to water, shocks, and extreme temperatures, which is important when working in harsh conditions, e.g., in car dash cams or devices used outdoors. The TBW (Terabytes Written) parameter indicates the total amount of data that can be written over the entire lifespan of the medium. The durable construction of cards ensures reliability and data safety even in demanding environments.
Leading Manufacturers Available at Senetic
- SanDisk (Western Digital) – the brand with the largest selection of memory cards at Senetic, including the Ultra, Extreme, and Extreme PRO series in microSD and SD formats. The High Endurance line is dedicated to continuous recording in CCTV surveillance cameras operating 24/7. SanDisk products are characterized by wide compatibility with network, mobile, and industrial devices.
- Samsung – a global leader in flash memory production, offering microSD and SD cards from the EVO, PRO, and PRO Endurance series. Samsung PRO Endurance cards are particularly valued in surveillance systems due to their exceptional durability during multiple data overwrites. Samsung's NAND technology translates to high reliability in industrial and server applications.
- Dell – an enterprise solutions manufacturer offering memory cards dedicated to servers and infrastructure devices as part of its portfolio. Chosen by IT departments valuing a uniform hardware environment, full service support, and integration with other Dell products in data center environments.
Register at the Senetic B2B Portal
Companies and resellers ordering memory cards in larger quantities can benefit from the dedicated Senetic B2B Portal. The portal provides access to preferential wholesale prices and tools that facilitate order management – from quickly submitting requests for quotes, comparing products, and creating favourite lists to a complaint panel and real-time invoice overview. B2B customers also have access to a promotions area and expert support.
FAQ – Frequently Asked Questions about Memory Cards
What memory card should I choose for an IP surveillance camera operating 24/7?
For CCTV systems operating continuously and dash cams, the resistance of the memory card to external factors such as water, shocks, or extreme temperatures is particularly important. It is advisable to choose models with a durable construction that ensure reliability even in harsh environmental conditions. High Endurance or Industrial series cards are recommended – e.g., SanDisk High Endurance or Samsung PRO Endurance. Such media are designed for multiple data overwrites, operation at elevated temperatures, and exhibit resistance to water, shocks, and X-ray radiation. Key parameters include a minimum speed class of U1/V10 (for Full HD) or U3/V30 (for 4K recordings) and a high TBW ratio guaranteeing long card lifespan.
What is the difference between SD and microSD cards and when should each format be used?
SD cards (full-size) and microSD cards differ in size and type – microSD cards are significantly smaller, making them an ideal choice for mobile devices such as smartphones and action cameras. The type of memory card matters for compatibility and application: SD cards are most commonly used in cameras, camcorders, and some laptops, while microSD cards are suitable for company phones, tablets, IP cameras, mobile terminals, and IoT devices. Most SD slots can accommodate microSD using the included adapter – reverse compatibility does not work.
What do the symbols on memory cards mean?
The markings on memory cards inform about the speed class and write and read speeds, which are crucial when selecting the appropriate medium for a specific application.
How many memory cards can I order for wholesale purchases at Senetic?
Senetic handles wholesale orders of any scale – both small batches for resellers and larger orders for large IT departments or system integrators. After registering on the B2B Portal, you gain access to current stock levels, the ability to submit requests for quotes, and individual pricing conditions based on order volume.
How long can data be stored on memory cards in corporate archives?
Professional memory cards retain data for 10 years or longer under appropriate storage conditions. The data retention parameter depends on the type of flash memory and storage temperature – lower temperatures extend the retention time.
What parameters of memory cards are most important when choosing for businesses?
Key parameters include capacity tailored to data volume, speed class appropriate for the application (V30 for 4K video, A2 for applications), compatibility with devices, and reliability parameters – MTBF and write cycle count for intensive applications.
