Optimize SD and microSD cards for cameras and smartphones

SD card Memory cards have become inseparable companions of professional photographers and users who own an Android smartphone, given their great utility in expanding the memory capacity without having to buy a new device every time and without having to delete the photos out of the blue or files already stored in internal memory.
If we are a beginner with this type of cards, we will have to learn a large amount of information before proceeding with the purchase, given that the formats, writing speeds and optimizations to be made according to the device in which it will be used change.
In this guide we will show you all useful information to optimize memory cards (SD and microSD cards) for cameras and smartphones, accompanied by a valid one buying guide with which to choose the best memory card according to our needs or the device in which it is to be used.READ ALSO: Which SD memory card to buy: types and differences

How to choose SD or microSD card

Before showing you the best cards we can buy, it is worth going into some very important aspects about memory cards in general and how to best use them in all scenarios.

  • Types of cards: there are many models of memory cards in electronics stores, the most common and most used types especially for digital cameras and cell phones are: CompactFlash (CS), Secure Digital (SD), Smart-media (SM, now obsolete), MultimediaCard (MMC), XD-Picture Card is Memory stick.Of these types of cards only the Secure Digital, also supplied in an optimized version for smartphones and calls microSD (which previously were also called TransFlash or T-Flash). Most DSLRs and compact digital cameras support simple SD cards, while on smartphones we can use the smaller and more compact microSDs. Market leaders and best brands of memory cards are Sandisk, Fuji, Lexa, Delkin, Viking and Kingston.
  • Memory capacity: since most digital cameras have a large number of Megapixels therefore they generate very large photos, the capacities are now comparable to those of a notebook hard disk: we can in fact find SD Cards and microSD cards of 64, 128, 256 and even 512 GB, with the first 1TB models already in circulation. A very important and often underestimated thing is the maximum memory capacity that the device is able to manage: if in the instructions or in the user manual it speaks of “SD or microSD support up to 32GB”, we will not be able to insert memory cards larger, under penalty of loss of data or total incompatibility of the chosen form. We always choose the card based on the maximum capacity that the device is able to manage.
  • Memory card speed: cards can have different performances in terms of writing and reading speed. For those who want to save many photos or record many videos, we always recommend focusing on fast writing cards; while for those who want to save many photos or documents in the external memory, it is better to focus on a fast card even when reading.
  • Formatting memory card: in order to better preserve all the files generated by the devices, we will have to make sure that the card is formatted by the same device that will use it, so as to make the most of it. We avoid formatting the SD Card or microSD card from a PC and then moving it to reflex cameras, cameras or smartphones: in most cases we will receive an error or the card will not be readable.
  • Safely remove the memory card: of course you should never remove a card from a camera while taking a photo just as you should not remove it from your smartphone if you are listening to music or using an app moved to the microSD. In addition, it is always better to turn off the electronic device before removing the card from its slot or use the safe removal function, available on all modern devices.
  • Portable multi-card reader: if we are professionals in the photographic sector we will never know which type of card we will have to use or on which computer we will have to connect it. To optimize the time available, we recommend that you always have a portable USB multi-card reader at hand, such as the one shown here -> USB 3.0 Super Speed ​​Multi Card reader 7 in 1 (€ 14).

Best memory cards and microSD cards

SD Reflex After seeing all the practical tips on how to choose and optimize a memory card, let’s see together which cards we can buy. To avoid having to always make the same product lists, we will first show you the SD Cards suitable for use on professional SLR cameras and compact cameras, then we will show you the microSD suitable for smartphones, complete with SD adapters (therefore usable also on reflex or compatible card readers).

SD cards for SLR and compact digital cameras

If we are looking for SD cards for professional SLR cameras or compact digital cameras, we recommend that you consider the following models, ordered according to the stated writing speed (from slowest to fastest):

  • Lexar Professional Cards 633x 128GB (27 €)
  • SanDisk Extreme Memory Card, 64 GB SDXC (25 €)
  • Lexar Professional 1667x SDXC – UHS-II cards, 64GB (27 €)
  • Sony 4 ‚GB Sdhc Secure Digital Flash Memory Card P 64 GB (53 €)

These models are compatible with all the reflex models on the market, we will only have to insert and format them from the operating system settings.

MicroSD for smartphones with SD adapter

If instead we want a microSD to be inserted in our smartphone or tablet with Android operating system, here are the models that we recommend you to view, ordered according to the maximum capacity:

  • Samsung EVO Plus 64 GB microSDXC card (11 €)
  • SanDisk Extreme 128 GB microSDXC Memory Card (26 €)
  • Lexar High performance cards 633x 128GB (21 €)
  • SanDisk Ultra 200 GB MicroSDXC Memory Card (€ 29)
  • SanDisk Extreme PRO 512 GB microSDXC memory card (€ 253)
  • SanDisk Extreme PRO 1 TB microSDXC memory card (€ 351)

Before buying any microSD card, make sure it is compatible with the smartphone or tablet in which it will be inserted, checking the user manual or the technical data sheet available online (where we will find a similar item “memory expandable up to 256 GB” or other values).
If instead we wanted to use a microSD inside the reflex or compact digital camera, simply use the adapter included in the package, but we warn you that the speed of writing and reading will be lower than the value declared on the microSD (to have the maximum speed on reflex and compact digital cameras should use the classic SD Card).


Choosing and optimizing an SD Card or a microSD is not a difficult operation, since it will be enough to pay attention to some details that can already be checked before purchasing to be sure to use the memory card that is right for us.

Did we accidentally delete or format a memory card? We can still attempt data recovery by reading the tips seen in our guide Recover deleted files and photos from memory card and USB sticks.
If instead we wanted to deepen the discussion on microSD to use on Android, we can continue reading on our article Choose the best MicroSD for Android smartphones.


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