$11.91
Get Fast, Free Shipping with Amazon Prime & FREE Returns
Return this item for free
  • Free returns are available for the shipping address you chose. You can return the item for any reason in new and unused condition: no shipping charges
  • Learn more about free returns.
How to return the item?
FREE delivery:
Get free shipping
Free shipping within the U.S. when you order $25.00 of eligible items shipped by Amazon.
Or get faster shipping on this item starting at $5.99 . (Prices may vary for AK and HI.)
Learn more about free shipping
Tuesday, Aug 10 on orders over $25.00 shipped by Amazon. Details
Fastest delivery: Friday, Aug 6
Order within 14 hrs and 32 mins
Details
In Stock.
$$11.91 () Includes selected options. Includes initial monthly payment and selected options. Details
Price
Subtotal
$$11.91
Subtotal
Initial payment breakdown
Shipping cost, delivery date, and order total (including tax) shown at checkout.
Your transaction is secure
We work hard to protect your security and privacy. Our payment security system encrypts your information during transmission. We don’t share your credit card details with third-party sellers, and we don’t sell your information to others. Learn more
Ships from Amazon
Sold by MemoryWhiz
Ships from
Amazon
Sold by
Return policy: This item is returnable
In most cases, items shipped from Amazon.com may be returned for a full refund.
SanDisk - SDDR-B531-GN6NN... has been added to your Cart
Other Sellers on Amazon
$11.91
FREE Shipping
Get free shipping
Free shipping within the U.S. when you order $25.00 of eligible items shipped by Amazon.
Or get faster shipping on this item starting at $5.99 . (Prices may vary for AK and HI.)
Learn more about free shipping
on orders over $25.00 shipped by Amazon.
Sold by: Pro-Distributing
Sold by: Pro-Distributing
(27689 ratings)
94% positive over last 12 months
In Stock.
Shipping rates and Return policy
$11.99
FREE Shipping
Get free shipping
Free shipping within the U.S. when you order $25.00 of eligible items shipped by Amazon.
Or get faster shipping on this item starting at $5.99 . (Prices may vary for AK and HI.)
Learn more about free shipping
on orders over $25.00 shipped by Amazon.
Sold by: XOXO Mobile
Sold by: XOXO Mobile
(15064 ratings)
96% positive over last 12 months
In Stock.
Shipping rates and Return policy
$12.99
FREE Shipping
Get free shipping
Free shipping within the U.S. when you order $25.00 of eligible items shipped by Amazon.
Or get faster shipping on this item starting at $5.99 . (Prices may vary for AK and HI.)
Learn more about free shipping
on orders over $25.00 shipped by Amazon.
Sold by: Amazon.com
Sold by: Amazon.com
In Stock.
Shipping rates and Return policy

SanDisk - SDDR-B531-GN6NN MobileMate USB 3.0 microSD Card Reader - SDDR-B531-GN6NN Black

4.8 out of 5 stars 231,239 ratings

List Price: $12.99 Details
Price: $11.91 Get Fast, Free Shipping with Amazon Prime & FREE Returns
Return this item for free
  • Free returns are available for the shipping address you chose. You can return the item for any reason in new and unused condition: no shipping charges
  • Learn more about free returns.
How to return the item?
You Save: $1.08 (8%)
Available at a lower price from other sellers that may not offer free Prime shipping.
Card Reader
Card Reader Only
Brand SanDisk
Flash Memory Type Micro SD
Color Black
Hardware Interface USB 3.0
Memory Storage Capacity 1 GB

About this item

    This fits your .
  • Make sure this fits by entering your model number.
  • Compact and durable microSD card reader
  • Fast UHS-I transfer speeds of up to 170 MB/s
  • With USB 3.0, move content up to 10x faster than USB 2.0 readers(2)
  • Compatible with USB 3.0 and backwards-compatible with USB 2.0
  • Two-year limited manufacturer warranty(1)
New & Used (12) from $10.57 FREE Shipping on orders over $25.00 shipped by Amazon.

Frequently bought together

  • SanDisk - SDDR-B531-GN6NN MobileMate USB 3.0 microSD Card Reader - SDDR-B531-GN6NN Black
  • +
  • SanDisk 128GB High Endurance Video MicroSDXC Card with Adapter for Dash Cam and Home Monitoring systems - C10, U3, V30, 4K UH
Total price:
To see our price, add these items to your cart.
Choose items to buy together.

Special offers and product promotions

  • Amazon Business: Make the most of your Amazon Business account with exclusive tools and savings. Login now

Have a question?

Find answers in product info, Q&As, reviews

There was a problem completing your request. Please try your search again later.
All Product Information Customer Q&A's Customer Reviews

Your question might be answered by sellers, manufacturers, or customers who bought this product.

Please make sure that you are posting in the form of a question.

Please enter a question.


From the manufacturer

Compare with similar items


SanDisk - SDDR-B531-GN6NN MobileMate USB 3.0 microSD Card Reader - SDDR-B531-GN6NN Black
2 in 1 High-Speed Portable Memory Card Reader SD 3.0 Transport Protocol, SD Card Reader USB 3.0 to SDXC, SDHC, SD, MMC, RS-MMC, Micro SDXC, Micro SD, Micro SDHC Card and UHS-I
Anker 2-in-1 USB 3.0 SD Card Reader for SDXC, SDHC, SD, MMC, RS-MMC, Micro SDXC, Micro SD, Micro SDHC Card and UHS-I Cards
SD Card Reader, uni USB C Memory Card Reader Adapter USB 3.0, Supports SD/Micro SD/SDHC/SDXC/MMC, Compatible for MacBook Pro, MacBook Air, iPad Pro 2018, Galaxy S20, Huawei Mate 30, and More
Anker USB-C and USB 3.0 SD Card Reader, PowerExpand+ 2-in-1 Memory Card Reader with Dual Connectors, for SDXC, SDHC, SD, MMC, RS-MMC, Micro SDXC, Micro SD, Micro SDHC Card, and UHS-I Cards
UGREEN SD Card Reader Portable USB 3.0 Dual Slot Flash Memory Card Adapter Hub for TF SD Micro SD SDXC SDHC MMC RS-MMC Micro SDXC Micro SDHC UHS-I for Mac Windows Linux Chrome PC Laptop
Customer Rating 4.8 out of 5 stars (231239) 4.5 out of 5 stars (947) 4.7 out of 5 stars (28193) 4.7 out of 5 stars (8028) 4.7 out of 5 stars (167) 4.7 out of 5 stars (9673)
Price $11.91 $10.28 $16.99 $17.99 $19.99 $11.99
Shipping FREE Shipping on orders over $25.00 shipped by Amazon or get Fast, Free Shipping with Amazon Prime FREE Shipping on orders over $25.00 shipped by Amazon or get Fast, Free Shipping with Amazon Prime FREE Shipping on orders over $25.00 shipped by Amazon or get Fast, Free Shipping with Amazon Prime FREE Shipping on orders over $25.00 shipped by Amazon or get Fast, Free Shipping with Amazon Prime FREE Shipping on orders over $25.00 shipped by Amazon or get Fast, Free Shipping with Amazon Prime FREE Shipping on orders over $25.00 shipped by Amazon or get Fast, Free Shipping with Amazon Prime
Sold By MemoryWhiz Amazon.com AnkerDirect Yooyee AnkerDirect UGREEN GROUP LIMITED
Hardware Interface USB 3.0 USB, microSDXC USB 2.0, USB 3.0, USB USB, USB Type C, USB 1.1, MicroSD, microSDXC USB, USB Type C, microSDXC, MicroSD USB 3.0
Item Dimensions 1.2 x 0.82 x 0.35 inches 2.95 x 1.02 x 0.35 inches 0.47 x 1.3 x 2.56 inches 3.09 x 0.76 x 0.45 inches 2.6 x 0.79 x 0.45 inches

Product description

Capacity:Card Reader  |  Style:Card Reader Only

The MobileMate USB 3.0 microSD card reader is the easy way to quickly transfer content from your camera or drone’s memory card. This compact and durable reader requires no downloads or software and is compatible with USB 3.0 and backwards-compatible with USB 2.0. And, with transfer speeds of up to 170MB/s, you can move what needs moving and then get going again. | Up to 170MB/s read speeds, engineered with proprietary technology to reach speeds beyond UHS-I 104MB/s, require compatible devices capable of reaching such speeds. | (1) See SanDisk website for additional information and limitations. | (2) Transfer to drive up to 10 times faster than standard USB 2.0 drives (4MB/s); USB 3.0 port required. Based on internal testing; performance may be lower depending upon host device.

Product information

Capacity:Card Reader  |  Style:Card Reader Only

Technical Details

Collapse all

Additional Information

Warranty & Support

Amazon.com Return Policy:You may return any new computer purchased from Amazon.com that is "dead on arrival," arrives in damaged condition, or is still in unopened boxes, for a full refund within 30 days of purchase. Amazon.com reserves the right to test "dead on arrival" returns and impose a customer fee equal to 15 percent of the product sales price if the customer misrepresents the condition of the product. Any returned computer that is damaged through customer misuse, is missing parts, or is in unsellable condition due to customer tampering will result in the customer being charged a higher restocking fee based on the condition of the product. Amazon.com will not accept returns of any desktop or notebook computer more than 30 days after you receive the shipment. New, used, and refurbished products purchased from Marketplace vendors are subject to the returns policy of the individual vendor.
Product Warranty: For warranty information about this product, please click here

Feedback

Would you like to tell us about a lower price?

Product guides and documents


Customer Questions & Answers

Customer reviews

4.8 out of 5 stars
4.8 out of 5
231,239 global ratings
How are ratings calculated?

Top reviews from the United States

Reviewed in the United States on May 30, 2019
Capacity: 128GBStyle: Card OnlyVerified Purchase
847 people found this helpful
Report abuse
Reviewed in the United States on November 29, 2018
Capacity: 128GBStyle: Card OnlyVerified Purchase
1,003 people found this helpful
Report abuse
Reviewed in the United States on March 2, 2019
Capacity: 128GBStyle: Card OnlyVerified Purchase
Customer image
5.0 out of 5 stars Legit card. Legit fast.
By Mike on March 2, 2019
This review is specifically for the item SanDisk Extreme 128GB microSD UHS-I Card with Adapter - 160MB/s with SanDisk MobileMate USB 3.0 microSD Card Reader. My card was shipped from and sold by Amazon.com. The top review for this card would have you believe the product I received, based on physical appearance, is fake. The speed tests and H2testw program appear to indicate it achieves the advertised speeds and has the correct capacity using the bundled USB 3.0 card reader in a USB 3.0 port on my desktop Windows 10 PC.
If this card is somehow "fake" it is quite impressive. I'm sure there are some fakes out there, but if you do decide to buy this card it might be worth performing your own tests before deeming it fake based off the looks alone (assuming it's not an incredibly obvious fake).
April 18, 2020 (13 month update): card still works great. No complaints, I'm very happy with it.
Images in this review
Customer image Customer image Customer image Customer image Customer image
Customer imageCustomer imageCustomer imageCustomer imageCustomer image
701 people found this helpful
Report abuse
Reviewed in the United States on October 14, 2018
Capacity: 128GBStyle: Card OnlyVerified Purchase
531 people found this helpful
Report abuse
Reviewed in the United States on October 2, 2018
Capacity: 64GBStyle: Card OnlyVerified Purchase
Customer image
1.0 out of 5 stars SanDisk 64GB (3) A2 Corrupted itself after week of light use!
By DagDerNiT on October 2, 2018
I have several mini memory cards from last year and none were fast enough for the new Dji Mavic Pro 2 or the ZOoom. There was even a warning that popped up on the GO 4 app that will say SLOW where the sd card info is. After installing the Sandisk Extreme U3 A2, the SLOW warning disappeared and all is well. Havent been able to use as the weather here in the great Pacific NW has been rainy but once the sun comes back I am flying!

***Update October 21st, 2018***
I ended up installing the microsd in my new Moto Z2 Force Smartphone right after the review, since the weather for flying the drone won't be nice again till next year. It worked awesome in the Moto for over a week until it died and said it became corrupted. I had many photos and videos that were transferred and lost. Called and emailed support and was asked to jump through hoops so am not very happy about the card and experience with it. Will be buying a different brand and hoping for a better ending.
Images in this review
Customer image
Customer image
460 people found this helpful
Report abuse
Reviewed in the United States on December 11, 2018
Capacity: 128GBStyle: Card OnlyVerified Purchase
259 people found this helpful
Report abuse
Reviewed in the United States on September 30, 2018
Capacity: 256GBStyle: Card OnlyVerified Purchase
180 people found this helpful
Report abuse
Reviewed in the United States on November 30, 2018
Capacity: 128GBStyle: Card OnlyVerified Purchase
Customer image
3.0 out of 5 stars Fast enough to use as extra storage on Surface Pro 6 but not as fast as expected
By Gabriel on November 30, 2018
The built-in SSD disk space is extremely expensive on the Surface Pro 6, so getting the smallest Surface Pro 6 and using a microSD card to complement the built-in storage is an attractive option in my opinion.
The good thing is that this card performs well when inserted in the microSD card reader of the Surface Pro 6 (about 80 MB/s sequential read, 80 MB/s sequential write) although it does not reach the advertised speed (which is "up to" 160 MB/s sequential read, 90 MB/s sequential write).
As I believe the UHS-1 standard is limited to 104 MB/s anyway I am not sure if it is possible to find microSD cards that would perform faster.
In short a good choice for the Surface Pro 6 even if possibly not the best choice.
Images in this review
Customer image
Customer image
164 people found this helpful
Report abuse

Top reviews from other countries

Kikkilatzi
4.0 out of 5 stars Gute Qualität und Performance ABER verwirrende Angaben auf der Packung
Reviewed in Germany on December 25, 2018
Capacity: 64GBStyle: Card OnlyVerified Purchase
Customer image
4.0 out of 5 stars Gute Qualität und Performance ABER verwirrende Angaben auf der Packung
Reviewed in Germany on December 25, 2018
Seit Jahren setze ich in meinen Kameras SANDISK Speicher ein.

Auch diese Speicherkarte ist ein Sandisk Qualitätsprodukt und mit einer lebenslangen Garantie ausgestattet.
Die wichtigen Performanceangaben dieser Karte lauten U3 und V30.

Damit ist die Karte durch die V30 Angabe für 4K Aufnahmen mit 60 fps und auch 120 fps in Video Kameras, Drohnen und anderen Aufzeichnungsgeräten geeignet. In meinem Fall soll sie in einer DJI Mavic Air ihren Dienst verrichten.
Zur Überprüfung der Performance habe ich mit der Version 6.02 des kostenlosen Tools „Crystal Disk Mark“ die Karte an meinem PC mit Hilfe eines USB 3.0 UGREEN Card Readers getestet. Das Testergebnis habe ich als Screenshot beigefügt.

Die erzielten Performance Werte von 94,02 MB/s beim sequentiellen LESEN und 66,19 MB/s beim sequentiellen SCHREIBEN bestätigen die ausgezeichnete Performance dieser Karte.
Einen Stern Abzug gibt es aber für die mir unverständlich erscheinende Aussage auf der Verpackung, wonach die Karte bis zu 160 MB/s Leserrate erzielen soll. Ich frage mich, wie man auf diese Angabe kommt. Die Schreibrate ist mit ihren tatsächlichen 66,19 MB/s sogar 10% höher als vom Hersteller angegeben.

Herstellerangaben auf der Verpackung:
Speed up to 160 MB/s read – 60 MB/s write

Die Karte habe ich für 25,99 EUR hier bei Amazon gekauft und sie erhält von mir eine klare Empfehlung, gerade auch im Hinblick auf den recht günstigen Preis. Schnell kann man nämlich für eine 64 GB Sandisk Extreme Pro (schwarz/rot) deutlich mehr Geld bezahlen (43,- EUR), obwohl sie lt. Spezifikation auch „nur“ V30 und U3 bietet. Sie mag im praktischen Test sicher bessere Werte liefern, wenn aber die Anforderungen des Gerätes mit einer Karte für weniger Geld auch erfüllt sind, muss man nicht zwingend mehr als nötig zahlen.

Einige erklärende Worte zu SD Speicher und ihren Spezifikationen

Ein Ausflug in das Bezeichnungswirrwarr von Speicherkarten, wobei ich die Reihenfolge nach ihrer Relevanz im heutigen Einsatz aufgeführt habe.

1. Kapazitätsangaben von SD Speicherkarten

SD: Secure Digital Memory Card mit bis zu 4GB Speicherplatz
SDHC: steht für High Capacity mit 4GB bis zu 32GB Speicher
SDXC: steht für Extended Capacity mit 64GB bis 2TB Kapazität

2. V-Angabe Video Speed – Mindest Schreibrate speziell bei VIDEO Aufnahmen

Die wichtigste Information beim Einsatz einer Speicherkarte als Video Aufnahmemedium stellen diese speziellen Performance Angaben dar, die leicht verständlich auswertbar sind.
Natürlich sind die U1, U2 und U3 Angaben (siehe weiter unten) sehr aussagefähig, wenn es um die Performance einer Speicherkarte geht. Mit der Angabe der Video Speed Class (V) kann man jedoch sofort erkennen, ob die Karte für die benötigte Aufnahme ausreichend schnell die Aufnahmedaten schreiben kann.
Der V-Wert gibt die MINIMALE Geschwindigkeit an, mit der VIDEO-Daten auf die Karte geschrieben werden. So kann man leicht ersehen, welche Karte für den benötigten Einsatzzweck notwendig ist.

V6 Video Schreibrate mindestens 6 MB/s
geeignet für 720p sowie 1080p und 1080i Aufnahmen

V10 Video Schreibrate mindestens 10 MB/s
geeignet für Full HD Aufnahmen und Echtzeitübertragung

V30 Video Schreibrate mindestens 30 MB/s
geeignet für 4K Aufnahmen mit 60 fps und auch 120 fps

V60 Video Schreibrate mindestens 60 MB/s
geeignet für 8K Videoaufnahmen mit bis zu 120 fps

V90 Video Schreibrate mindestens 90 MB/s
geeignet für 8K Videoaufnahmen mit bis zu 120 fps

3. Karten Klassen Class 2,4,6, 10 und U1, U2 U3

Früher waren die Class 2,4,6 und 10 Angaben noch oft verbreitet und üblich, die heute aber kaum noch für aktuelle Einsatzzwecke ausreichende Performance bieten. Die Zahlen hinter den Class Angaben geben die Mindest Schreibraten an. Eine MicroSd Class 10 Karte ist mit 10 MB/s SCHREIB Rate ausgestattet, eine Class 2 nur mit 2 MB/s.
Aktuelle Karten besitzen die neueren U Bezeichnungen.

U1 für 10 MB/s Schreibrate
U2 für 20 MB/s Schreibrate
U3 für 30 MB/s. Schreibrate

Geht es um Anwendungen im 4k oder 8k Video Aufnahme Modus, kommen nur U3 Karten in Betracht, die entsprechend hohe Werte bei der Schreibrate aufweisen. Aussetzer oder Abbrüche und Fehlermeldungen während der Video Aufzeichnung können die Folge sein, wenn eine Karte nicht die vom Gerät benötigte Video Schreibrate zur Verfügung stellt.

4. A-Angabe - Applikation Performance (Smartphones)

Diese Angabe ist für den Einsatz vor allem in Smartphones relevant, da damit die Mindest- Schreib und Leserate einer SD Karte definiert ist, wenn die Karte vom Telefon oder Tablet als aktiver Speicher genutzt wird. Die Performance wird damit in Abhängigkeit der Input/Output operations Per Second angegeben. Je größer der IOPS-Wert, desto schneller ist der Datenträger bei Einsatz in einem Smartphone oder Tablet. Hier kommt es weniger auf die maximale Schreibgeschwindigkeit an, sondern darauf, wie viele Operationen pro Sekunde auf bzw. mit der Karte möglich sind.

A1 Mindestleserate bei 1500 IOPS; Mindestschreibrate bei 500 IOPS
A2 Mindestleserate bei 4000 IOPS; Mindestschreibrate bei 2000 IOPS

5. Interface Spezifikationen UHS und Klassen I, II, III

Damit es noch etwas verwirrender wird, wurde auch für das Interface noch eine spezielle Spezifikation definiert. Nicht jede Karte läuft nämlich auch in jedem Gerät. Dazu muss man wissen, dass sowohl auf Karten-, als auch auf Geräte Seite Definitionen des Datenübertragungssystems existieren.

UHS-I:
Spec. V 3.01 mit 12,5 MB/s (SDR12), 25 MB/s (SDR25), 50 MB/s (SDR50, DDR50) oder 104 MB/s (SDR104)

UHS-II:
Spec. V 4.00 oder 4.01 mit 156 MB/s (FD156) bzw. 312 MB/s (HD312)

UHS-III:
Spec. V 6.0 mit 312 MByte/s (FD312) oder 624 MByte/s (FD624)

Ältere SD Speicherkarten, die eine UHS Kennzeichnung besitzen, sind mit SDXC und SDHC Karten kompatibel. Ohne eine zusätzliche Kennzeichnung der Klasse in Form einer I, II oder III kann die Datenrate jedoch niedriger sein.

Nachwort
MB/s Megabyte pro Sekunde ist NICHT zu verwechseln mit Mbit/s also Megabit pro Sekunde.
Die Internet Datenleitung liefert Daten nach Hause. Die Daten Übertragungsrate wird hier in Mbit/s angegeben. Ein Internet Anschluss hat beispielsweise 50 Mbit. Das heute übliche Gigabit LAN zu Hause bietet eine Übertragungsrate von 1 Gbit/s. Das hört sich nach viel an, aber im Vergleich mit den Daten Schreib- und Leseraten der Speicherkarten, ist es nicht wirklich annähernd so schnell. Nur das Gigabit LAN daheim kommt an die Geschwindigkeit von schnellen SD Karten heran.
Mit einem Gigabit LAN kann man theoretisch bis zu 125 MB/s übertragen. In der Praxis wird man meist deutlich unter diesem Wert bleiben. Der 50 Mbit Internet Anschluss hingegen ermöglicht es Daten mit maximal 6,25 MB/s zu streamen (Empfang).
Ich habe diese Info zu meiner Rezension hinzugefügt, da ich bei Gesprächen mit Freunden oft feststelle, dass Verwechselungen zwischen MB/s und Mbit bzw. Mbit/s an der Tagesordnung sind.
Images in this review
Customer image
Customer image
1,334 people found this helpful
Report abuse
Giovanni (MigliorSoluzione)
5.0 out of 5 stars Ottimo rapporto qualità/prezzo. Consigliata anche da GoPro.
Reviewed in Italy on November 28, 2020
Capacity: 32GBStyle: Card OnlyVerified Purchase
Customer image
5.0 out of 5 stars Ottimo rapporto qualità/prezzo. Consigliata anche da GoPro.
Reviewed in Italy on November 28, 2020
Ho acquistato questa Sandisk Extreme U3 V30 (versione da 32gb) al buon prezzo di 14 euro circa. Prima dell’acquisto di questa sd ne ho valutate anche altre andando a controllare le varie caratteristiche che le compongono e alla fine ho scelto questa per l’ottimo rapporto qualità/prezzo.

( Comunque, se siete alla ricerca di una sd economica, quindi con prezzo più basso ma comunque ottima con la quale non dovete farci chissà che cosa, allora vi consiglio di dare un'occhiata anche a questa: copiate e incollate il link su google per aprirlo
amzn.to/2uQrK3i )

CHIARIMENTI SULLE SIGLE
Le sd sono piene di sigle o parametri che identificano in generale la qualità del prodotto perciò scrivo una piccola guida, semplificata, su cosa significano queste sigle.

- SDHC: identifica la capienza delle schede. Una scheda da 32gb come questa è sdHC. Una da 64gb viene indicata come sdXC.
- CLASS: questa è una vecchia classificazione, ormai superata, e identificava la velocità di scrittura minima della sd. Class10 (10mb/s) class6 (6 mb/s) ecc.
- UHS-I, UHS-II: queste due sigle identificano il nuovo standard da prendere in considerazione quando acquistiamo questi prodotti. Uhs-I supporta velocità di scrittura fino a 104 mb/s, mentre uhs-II fino a 312 mb/s. L’acquisto dell’una o dell’altra dipende dal dispositivo nel quale andrete ad inserirla (es. fotocamera) e quindi dal tipo di bus compatibile dalla fotocamera in questo caso. Se un dispositivo è di tipo uhs-I non supporterà le velocità del uhs-II se inserite una sd con questo standard.
- U1 U3: diciamo che questa è una sigla molto importante. Sulla scheda di trova una sorta di U con dentro il numero 1 o 3. Indicano la velocità minima di scrittura di 10mb/s o 30mb/s. In linea generale U1 è adatta per video hd e fullhd. U3 è indicata anche per video in 4k. Vi consiglio di prendere la U3!
- V30, V60 ecc.: nuovo standard che si riferisce alla velocità minima garantita in una registrazione video. V30 equivale a 30mb/s e così via. In generale V30 è adatta per registrazione di video in 4k. Con V60 V90 arriviamo anche agli 8k.
- A1 e A2: è un nuovo standard indicato per gli smartphone android nei quali è possibile installare app anche su memoria esterna. In particolare le sd con questa sigla svolgono molte più operazioni al secondo rispetto ad altre tradizionali e ciò si traduce in velocità molto maggiore, per esempio, quando si avvia un app. Se cercate su youtube “Sandisk Extreme A1, test di velocità apertura app” troverete un video dove mostra la differenza netta di velocità tra un sd standard e una A1. A2 ha prestazioni ancora più elevate.

SANDISK EXTREME U3 v30 A1
Dopo questi piccoli chiarimenti sulle sigle, facendo un rapporto con la sandisk extreme in questione possiamo renderci conto che è una sd di tutto rispetto in quanto:
- è di tipo UHS-I U3, quindi velocità minima di scrittura a 30mb/s rispetto a tante altre U1 che hanno un costo simile. Sulle GoPro per un funzionamento affidabile sono consigliate sd U3.
- È di tipo V30: quindi in registrazione riesce a sostenere una velocità minima di 30mb/s rispetto a tante altre, ad un prezzo simile, che non hanno proprio questa sigla.
- A1: ideale se dovete utilizzarla su uno smartphone android per i motivi citati sopra nella guida.
In sostanza, questa sd dal costo di 14 euro racchiude molte specifiche interessanti ad un prezzo contenuto. Volendo esiste anche la classica SD Samsung evo da 32gb al costo di 8 euro circa però è una U1 (non U3), non V30 e non A1.

Viene consigliate anche da GoPro tra le sd adatte per la HERO7.

Per quanto riguarda il test di lettura e scrittura, ho testato il prodotto sul mio notebook hp pavilion dv6 tramite lo slot dedicato e i risultati sono:
Lettura: 87 mb/s e 86mb/s
Scrittura: 50mb/s e 63mb /s

Lascio screen dei test. Facendo una ricerca in internet, altri test affermano che sono riusciti a toccare picchi di 99,5mb/s in lettura e addirittura 72,2 mb/s in scrittura, superando il limite dichiarato dalla casa produttrice di 60mb/s.

Faccio presente, inoltre, che questo tipo di scheda è:
- immune ai rivelatori a raggi X aeroportuali.
- Impermeabile IEC 529 IPX7
- Resistente alle temperature: -25 ºC a +85 ºC per 100 cicli (equivalenti a 28 ore).
- Resistenti a urti e vibrazioni: tollerano urti sino a 500 G

Spero di esservi stato utile, ciao!
Images in this review
Customer image Customer image Customer image Customer image Customer image
Customer imageCustomer imageCustomer imageCustomer imageCustomer image
630 people found this helpful
Report abuse
Benoît
5.0 out of 5 stars 👍🏼 Ce n'est que du bonheur en vidéo ! 👍🏼
Reviewed in France on August 25, 2018
Capacity: 32GBStyle: Card OnlyVerified Purchase
720 people found this helpful
Report abuse
SotiCoto
3.0 out of 5 stars They could at least be honest with the capacity of these things.
Reviewed in the United Kingdom on February 18, 2019
Capacity: 128GBStyle: Card OnlyVerified Purchase
317 people found this helpful
Report abuse
Orazio Di Mauro
3.0 out of 5 stars Buona ma non adatta alle nuove tecnologie
Reviewed in Italy on November 15, 2018
Capacity: 64GBStyle: Card OnlyVerified Purchase
339 people found this helpful
Report abuse