What are the real speeds for 3.1 type-c USB Drive

[keavlar]

Hey, 

So I bought a new 3.1 usb type-c Flash Drive.

And I do not see that of a difference between 3.0 and 3.1.

 

My MAIN QUESTION: PLEASE ANSWER IT! 

 What are the speeds for :

 

Reading from USB (if I transfer a 4gb file from USB)

Write speed (When I write / copy a 4gb file to a flash drive)

 

Because, the results I see really bad, and not what I expected.

And over internet, I can't find a proper answer for write speeds. 

 

[chudtopia]

could you link the drive here

[keavlar]

1 minute ago, chudtopia said:

could you link the drive here

I would prefer the speeds by preference, in total, what expect from 3.1 , but sure:

 

 

https://shop.westerndigital.com/products/usb-flash-drives/sandisk-ultra-dual-drive-luxe-usb-3-1-type-c#SDDDC4-128G-A46

[chudtopia]

im pretty sure this is correct, usb 3.0 has a bandwidth of 5Gb/s and usb 3.1 has a bandwidth of 10Gb/s, but that exactly mean it can read and write 10Gb/s and so it would have a slower read/write because of flash memory

[keavlar]

1 minute ago, chudtopia said:

im pretty sure this is correct, usb 3.0 has a bandwidth of 5Gb/s and usb 3.1 has a bandwidth of 10Gb/s, but that exactly mean it can read and write 10Gb/s and so it would have a slower read/write because of flash memory

So you saying...

I should get a read and write speed over 500mbs? 

 

[chudtopia]

and if i had to guess, its probably about 150MB/s read and I think about 45MB/s

[keavlar]

Just now, chudtopia said:

and if i had to guess, its probably about 150MB/s read and I think about 45MB/s

Clouse , write in between 16~60mbs.

Which annoys me. 

[mariushm]

The interface speed ( usb 5 gbps , usb 10gbps) is different than actual capabilities of a product.

 

The actual transfer speeds will depend on the flash memory used and the controller inside.

 

There's a datasheet on the page linked : https://documents.westerndigital.com/content/dam/doc-library/en_us/assets/public/sandisk/product/usb-flash/ultra-dual-drive-luxe-usb-3-1-type-c/data-sheet-ultra-dual-drive-luxe-usb-3-1-type-c.pdf

 

It only says sequential read speed up to 150 MB/s though... so from my limited experience with such usb sticks... expect around 100-120 MB/s reads, and up to around 100 MB/s writes.

Usually sustained write speeds are a bit less than read speeds.

[chudtopia]

also because usbs stupid naming, usb 3.0 and usb 3.1 gen 1 are the same

[keavlar]

2 minutes ago, mariushm said:

The interface speed ( usb 5 gbps , usb 10gbps) is different than actual capabilities of a product.

 

The actual transfer speeds will depend on the flash memory used and the controller inside.

 

There's a datasheet on the page linked : https://documents.westerndigital.com/content/dam/doc-library/en_us/assets/public/sandisk/product/usb-flash/ultra-dual-drive-luxe-usb-3-1-type-c/data-sheet-ultra-dual-drive-luxe-usb-3-1-type-c.pdf

 

It only says sequential read speed up to 150 MB/s though... so from my limited experience with such usb sticks... expect around 100-120 MB/s reads, and up to around 100 MB/s writes.

Usually sustained write speeds are a bit less than read speeds.

When will they fix it Jesus. What is the point in usb 3.1 and 3.2 if it still the same speeds, more or less. 

[chudtopia]

you can look at it on linus's channel

 

[chudtopia]

and on the website it says that the flashdrive is a 3.1 gen 1

[mariushm]

4 minutes ago, keavlar said:

When will they fix it Jesus. What is the point in usb 3.1 and 3.2 if it still the same speeds, more or less. 

Because nobody stops you from buying an actual SSD and place it in an  external case and use it at high speeds.

Because usb sticks are the modern equivalent of floppy disks, temporary, lower quality, lower endurance storage ... nobody cares about making controllers with super fast speeds because nobody would pay for them, everyone wants very cheap usb sticks.

Because the actual form factor (a usb stick) doesn't make it easy to get high speeds - you would get high speeds by using RAM as write buffer (so an extra chip) and multiple Flash memory chips to read and write in them in parallel, as a SSDs does.

 

There are usb devices that get close to interface speed ... capture cards, external ssds ... and so on.

Nobody claimed the usb stick was capable of the maximum transfer speeds.

 

Between usb sticks and ssds you have SD cards and specialized cards for digital cameras and video cameras.... and those have higher quality flash and higher endurance and higher speeds and you can often find adapters to convert them to usb stick.

[Chris Pratt]

How it connects is only part of the equation. Just because the bus bandwidth is 10Gbps, doesn't mean the drive can push that hard. In the specs, it clearly says:

 

Quote

Quickly move files to your computer
Say goodbye to emailing photos between devices. Once files are on your SanDisk Ultra® Dual Drive Luxe, the high-end USB 3.1 Gen 1 performance with 150MB/s read speeds let you quickly move your files to your computer.¹

 

So 150MBps is the absolute fastest it will go. Notice the little superscript at the end:

 

Quote

1. Read speeds up to 150MB/s. Write speed lower and vary by capacity. USB Type-C port with USB 3.1 Gen 1/ USB 3.0 support required. Based on internal testing; performance may be lower depending upon host device, interface, usage conditions and other factors. 1MB = 1,000,000 bytes.

 

That's not abnormal. Reads are usually faster, and what drive manufacturers advertise because they like big top line numbers. Also, like all drives, that's sequential. 4K random is far more common in normal day to day usage, and is always *much* slower.

[keavlar]

Thanks for all relevant answers, and sarcastic as well