My wife had a 16gb sd card originally,but because of Audible,she filled it pretty damn quick,so I wanted one with decent capacity.This was cheap and would be easy to replace,or so I thought.The card itself was no issue,but as a warning to others,be aware you may have to format the original card if it was set as INTERNAL storage.If you set it up as external you should be ok to just take it out and copy it straight to this card to set this one up as external storage,which means you shouldn't have to redownload any stuff,but its a different story if you had the original as internal storage.I tried cloning the card,copying it,allsorts and just couldn't get it to work.
So in the end I just formated the old card,formatted the new card as external storage,and told her she had to redownload all the stuff she had.Wasn't an issue in the end,she just wanted the extra space,but it did frustrate me a little.
in conclusion,the card works great,was cheap,and easy to install.Worth every penny,until she fills it up again :)
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Reviews with images
Decent linear reads and writes but slow NAND controller means it is bad for smartphone use
For my testing, I used a Transcend RDF8 USB 3.1 Gen 1 card reader. The reader tops out at around 98-100MB/s, which is the max for the UHS 1 standard. The 170MB/s advertising is based on an alternate operation mode that the card supports for reads, which deviates from the UHS 1 standard. Currently no camera or other similar device will use those operation modes, thus it is mainly suitable for quickly copying content from the card if you have a compatible card reader.While a decent price for the capacity, the possible use cases for this series of micro SD card is more limited due to the slow NAND controller used.If you look at the write IOPS, you will notice that it is only capable of around 4-6 IOPS when doing 4K random writes.This shows that the way the NAND is managed by the controller is focused purely on reading and writing large files linearly. This is find for use in a camera or other similar device, but anything requiring you to copy a large number of very tiny files to it, will encounter very poor write speeds.Beyond that, one bit of good news about the item, is it doesn't seem to be using QLC NAND which if possibly the worst thing to encounter in NAND storage. Storage devices using QLC will encounter large write speed drops after a few GB of writing. This is common in cheaply made cards that want to mislead on specs, as they can get the massive BOM cost savings of using QLC, but charge TLC NAND type pricing, while only offering a tiny fraction of the write endurance and not having consistent performanceThis card seems to use TLC NAND with no need for an SLC or MLC cache, as it is fast enough to maintain write performance across the entire length of the storage.This means that the card is suitable for high bit rate video recording such as 4:2:2 10 bit without much trouble.Cards using QLC as well as many counterfeit cards will have issues with video recording as they use a small SLC or MLC cache of a few GB in order to pass most common benchmarks, but the area that they cannot cheat on is a 100% fill test as you are measuring the performance while filling the drive to 100% with no breaks for any caches to empty.With this in mind, I can determine that the card I purchased is genuine, but the 1K - 32K random write performance is extremely low to a point where they are useless for such tasks.
Top reviews from United Kingdom
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Reviewed in the United Kingdom on 5 October 2023
Size Name: 128 GBStyle Name: SD Adapter IncludedVerified Purchase
Reviewed in the United Kingdom on 29 June 2024
Size Name: 128 GBStyle Name: SD Adapter IncludedVerified Purchase
Reviewed in the United Kingdom on 25 November 2023
Size Name: 128 GBStyle Name: SD Adapter IncludedVerified Purchase
Reviewed in the United Kingdom on 3 July 2024
Size Name: 128 GBStyle Name: SD Adapter IncludedVerified Purchase
Reviewed in the United Kingdom on 31 May 2024
Size Name: 128 GBStyle Name: SD Adapter IncludedVerified Purchase
Reviewed in the United Kingdom on 1 July 2024
Size Name: 128 GB (Pack of 2)Style Name: SD Adapter IncludedVerified Purchase
Reviewed in the United Kingdom on 27 May 2024
Size Name: 128 GBStyle Name: SD Adapter IncludedVerified Purchase
Reviewed in the United Kingdom on 3 July 2024
Size Name: 128 GBStyle Name: SD Adapter IncludedVerified Purchase
Top reviews from other countries
Ótimo produto chegou certinho e funcionando perfeitamente. Recomendo
Produto excelente
Reviewed in Brazil on 18 June 2024Size Name: 128 GBStyle Name: SD Adapter IncludedVerified Purchase
Barbara
SD card
Reviewed in Canada on 16 April 2024Size Name: 128 GBStyle Name: SD Adapter IncludedVerified Purchase
TAHSİN GÖKHAN
Paket ve kargo hızı
Reviewed in Turkey on 6 July 2024Size Name: 128 GBStyle Name: SD Adapter IncludedVerified Purchase
ferran
Tarjeta micro SD de 128 Gb con adaptador
Reviewed in Spain on 4 July 2024Size Name: 128 GBStyle Name: SD Adapter IncludedVerified Purchase
محمد على محمود محمد
شكراً أمازون
Reviewed in Egypt on 30 June 2024Size Name: 128 GBStyle Name: SD Adapter IncludedVerified Purchase
