SanDisk Ultra DUAL-USB 256GB, USB 3.0 Flash Drive up to 150MBps transfer speeds = £59.99 @ Amazon
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SanDisk Ultra DUAL-USB 256GB, USB 3.0 Flash Drive up to 150MBps transfer speeds = £59.99 @ Amazon

29
Found 28th Aug 2017Edited by:"Crossbow"
Lowest it has fallen for a while - previously £76 (CCC price history below).

Model: SDDD2-256G-GAM46 (<< link to Sandisk product page for more details)

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  • Allows you to transfer files from a smartphone or tablet to your PC or Mac computer
  • Micro-USB connector on one side and USB 3.0 connector on the other
  • Data storage capacity of up to 256GB
  • High-speed USB 3.0 performance with up to 150MB/s file transfer from drive to computer
  • Check the compatibility chart for listing of supported smartphones and tables [could be outdated, so use the OTG-checker apps below or ask in the thread if in doubt]
  • SanDisk Memory Zone app compatible - use it to monitor available memory and efficiently manage, organize & back up files stored on your Android smartphone.
  • USB drive is automatically detected when used with compatible devices - PC and Mac computers running Windows Vista, Windows 7, Windows 8, Windows 10, and Mac OS 10.6+ - no drivers required.
  • It is backed by a 5-year limited warranty.

Note:
- Your phone needs to be OTG-enabled to work with it - OTG-checker apps (or ask if your phone is compaible or not in the thread):
play.google.com/sto…_GB
play.google.com/sto…_GB
- Also, the phone needs to have a micro-USB connector - otherwise you'll need an additional adapter if it's Type-C for example

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29 Comments
Nicw
nice if you need the space but a bit pricey for something that you can loose easily
Had a few of these previously (smaller capacity), work great but all of them have sooner or later fallen apart. Not very well built. Heated for the price though..
"Data storage capacity of up to 128GB" the Amazon description needs to be updated.
"USB 2.0 connector" Would USB 3.0 be a lie?
They are called Ultra because they are Ultra slow. I bought the 64gb dual version, little brother to the one posted. I then bought the normal type A ultra. They are poles apart. The dual version hardly makes usb 2 speeds at times. Data transfer from phones is slow anyway but don't waste your money on the dual type. Buy a full size usb drive and then a converter lead for about £1.50.
Original Poster
Musicrab12 m ago

"Data storage capacity of up to 128GB" the Amazon description needs to be …"Data storage capacity of up to 128GB" the Amazon description needs to be updated."USB 2.0 connector" Would USB 3.0 be a lie?


Corrected now. The link goes to options offering 16 - 256Gb capacities.

Checked the Sandisk site (click on the model number link in the op) & it's USB 3.
Edited by: "Crossbow" 28th Aug 2017
It says USB 2.0 in the details but 3.0 in the heading. USB2.0 can in theory do 480mbps I thought? So this if this is only doing 150 it is even slower.

256GB is almost 4 hours at a 150mbps transfer speed, and that is only an upto transfer speed.

The 128GB is better.
Edited by: "CoeK" 28th Aug 2017
Great price for a decent size usb drive.

These dual connector drives are handy but as others have rightly said, they're tediously slow to transfer with either connector regardless of source machine.

I've literally watched performance when copying files via PC (usb 2.0 or 3.0) and seen speeds vary between about 15mb/s down to about 350k/s then it stops altogether for about 5-10 seconds before speeding back up and then shortly after dropping again.

I still use them (128gb and 32gb) but I can't recommend them for their copy performance - it's dire. Playback is fine though and these will happily allow smooth playback of 1080p video content to bluray players, phones, tv's etc.
CoeK24 m ago

It says USB 2.0 in the details but 3.0 in the heading. USB2.0 can in …It says USB 2.0 in the details but 3.0 in the heading. USB2.0 can in theory do 480mbps I thought? So this if this is only doing 150 it is even slower.256GB is almost 4 hours at a 150mbps transfer speed, and that is only an upto transfer speed.The 128GB is better.


MB and Mb are different units, big B is bytes, little B is bits (8-10 times smaller, sometimes they say 10 as that would include parity bits). So if it is up to 150MB/s that would be USB3.0.

I think maybe these are falling in price as people would probably want to start looking at USB-C connectors on the other end not micro-USB.
Neostar39 m ago

nice if you need the space but a bit pricey for something that you can …nice if you need the space but a bit pricey for something that you can loose easily


Just tighten it up then
AmyX3 m ago

Just tighten it up then


haha my crappy spelling
plewis0031 m ago

MB and Mb are different units, big B is bytes, little B is bits (8-10 …MB and Mb are different units, big B is bytes, little B is bits (8-10 times smaller, sometimes they say 10 as that would include parity bits). So if it is up to 150MB/s that would be USB3.0.I think maybe these are falling in price as people would probably want to start looking at USB-C connectors on the other end not micro-USB.

The heading says bits...
great price for the amount of space. Heated on that basis. I have the 128GB model. Never had a problem with it but it does feel a bit wobbly at times but I guess you lose a bit in build quality by having the dual connectors...
Cracking price, cheers OP.
I don't like these, they're very slow and quite often completely stop working when they get hot during a transfer. Definitely can't be use for large volume transfer.
CoeK1 h, 38 m ago

The heading says bits...




What heading?
plewis0022 m ago

What heading?


Of the Amazon page. Also it was the heading of this thread at the time.
Shame that is not usb type c.
I have two of the smaller capacity versions and they are excellent. However at this price i would be tempted to buy something faster and a addaptor.
CoeK2 h, 2 m ago

Of the Amazon page. Also it was the heading of this thread at the time.


All of the Amazon title is in lower case, it's meant to be up to 150MB/s (megabytes) - they don't do memory sticks in megabits, it's only that USB2.0 and USB3.0 generally are stated in bits not bytes
plewis001 h, 48 m ago

All of the Amazon title is in lower case, it's meant to be up to 150MB/s …All of the Amazon title is in lower case, it's meant to be up to 150MB/s (megabytes) - they don't do memory sticks in megabits, it's only that USB2.0 and USB3.0 generally are stated in bits not bytes

I don't know what you are talking about. The transfer speed is stated as 150mbps on the 264GB stick, it is different if you pick the 128GB stick.

I understand the difference, I didn't need the definition, nor do I need to know how many bits are in a byte etc.
CoeK5 h, 11 m ago

I don't know what you are talking about. The transfer speed is stated as …I don't know what you are talking about. The transfer speed is stated as 150mbps on the 264GB stick, it is different if you pick the 128GB stick.I understand the difference, I didn't need the definition, nor do I need to know how many bits are in a byte etc.


Because you said: 'USB2.0 can in theory do 480mbps I thought? So this if this is only doing 150 it is even slower.' Which is two different SI units - that's why I even said it, that quote suggests you didn't understand it. USB2 is 480Mbps which works out to around 40MB/s real world and this is up to 150MB/s read speed which is not slower and is USB3.0 anyway. Doesn't really matter just trying to make sense of that comment - anyway it's back up to £75.99.
Edited by: "plewis00" 29th Aug 2017
plewis001 h, 59 m ago

Because you said: 'USB2.0 can in theory do 480mbps I thought? So this if …Because you said: 'USB2.0 can in theory do 480mbps I thought? So this if this is only doing 150 it is even slower.' Which is two different SI units - that's why I even said it, that quote suggests you didn't understand it. USB2 is 480Mbps which works out to around 40MB/s real world and this is up to 150MB/s read speed which is not slower and is USB3.0 anyway. Doesn't really matter just trying to make sense of that comment - anyway it's back up to £75.99.


You keep saying this does 150MB/s but the Amazon page doesn't say that for the 264GB drive. Nor does the title here.

The Amazon page also says the 264GB drive has USB 2.0 which as you said isn't capable of 150MB/s.
USB 3.0 is capable of much faster than 150MB/s. Strange isn't it.

My point is that it isn't actually clear what you'll be getting and it sounds like the Amazon page is for more than one generation of this drive.
CoeK1 h, 27 m ago

You keep saying this does 150MB/s but the Amazon page doesn't say that for …You keep saying this does 150MB/s but the Amazon page doesn't say that for the 264GB drive. Nor does the title here. The Amazon page also says the 264GB drive has USB 2.0 which as you said isn't capable of 150MB/s.USB 3.0 is capable of much faster than 150MB/s. Strange isn't it.My point is that it isn't actually clear what you'll be getting and it sounds like the Amazon page is for more than one generation of this drive.



It says '[3] Read speeds from drive to computer up to 150 MB/s. Write speeds lower and vary by drive capacity. USB 3.0 port required. Based on internal testing; performance may be lower depending upon host device.'

It refers to a 'USB2.0 connector' which is physically identical to USB3.0 Type-A for the purposes of this device. It's also 256GB not 264GB.

I only bought it up originally because of that comment but it doesn't matter as it's expired. I think there were USB2.0 drives of this type but not at 256GB capacity
plewis009 m ago

It says '[3] Read speeds from drive to computer up to 150 MB/s. Write …It says '[3] Read speeds from drive to computer up to 150 MB/s. Write speeds lower and vary by drive capacity. USB 3.0 port required. Based on internal testing; performance may be lower depending upon host device.'It refers to a 'USB2.0 connector' which is physically identical to USB3.0 Type-A for the purposes of this device. It's also 256GB not 264GB.I only bought it up originally because of that comment but it doesn't matter as it's expired. I think there were USB2.0 drives of this type but not at 256GB capacity

This is all going in circles really. The connector is type A not 2.0 or 3.0 or whatever.0

My phone seems to like the number 264 better for some reason.

The drive is slower then 3.0 by a fair margin so I wouldn't buy it full stop.
CoeK8 m ago

This is all going in circles really. The connector is type A not 2.0 or …This is all going in circles really. The connector is type A not 2.0 or 3.0 or whatever.0My phone seems to like the number 264 better for some reason. The drive is slower then 3.0 by a fair margin so I wouldn't buy it full stop.


Fine but that's a pointless reason for not buying it if that was your reason as even a modern full-fat SSD is barely going to saturate USB3.0. 150MB/s anything definitely needs USB3.0 was meant to be my point.
plewis001 h, 10 m ago

Fine but that's a pointless reason for not buying it if that was your …Fine but that's a pointless reason for not buying it if that was your reason as even a modern full-fat SSD is barely going to saturate USB3.0. 150MB/s anything definitely needs USB3.0 was meant to be my point.



If I was buying high capacity it would be because I need to move a large amount of data around. I do need to move it around but I also don't want to be sitting in the office just waiting for it to move, I want it done as fast as possible.

I am sure this would be fine for people who just want to stick a movie on it and be able to play it from somewhere else, as long as you don't need to regularly transfer to and from it in a timely manner.
CoeK8 m ago

If I was buying high capacity it would be because I need to move a large …If I was buying high capacity it would be because I need to move a large amount of data around. I do need to move it around but I also don't want to be sitting in the office just waiting for it to move, I want it done as fast as possible.I am sure this would be fine for people who just want to stick a movie on it and be able to play it from somewhere else, as long as you don't need to regularly transfer to and from it in a timely manner.


Of course, but the dual connector suggests it's for moving things around easily and compact-size rather than performance. You'll want a Corsair Voyager GTX or SanDisk Extreme I guess then. Personally, I don't mind the wait as I always found memory sticks kind of disposable (well not disposable but they definitely have a habit of going 'missing' more frequently).
plewis005 m ago

Of course, but the dual connector suggests it's for moving things around …Of course, but the dual connector suggests it's for moving things around easily and compact-size rather than performance. You'll want a Corsair Voyager GTX or SanDisk Extreme I guess then. Personally, I don't mind the wait as I always found memory sticks kind of disposable (well not disposable but they definitely have a habit of going 'missing' more frequently).



I have a variety of memory sticks, actually think I have a couple of really slow low capacity sticks at home, I think 8MB.

I really fancy a 2TB Samsung T3 with USB 3.1 but even my work draws the line there price wise
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