Fluctuating USB 3.0 write speeds

[I am an SSD]

I have been getting very inconsistent write speeds to my USB 3.0 flashdrive from sandisk. Its brand new and there is no reason to think that age might be a problem.  I have attached a picture for your reference. 

 

I get anywhere from 30-40 MBps in the beginning and then it comes to to 15, after which it varies between 8-15 periodically.  

 

Seeing that it is a USB 3.0 flashdrive I expected better write speeds (Read starts at 120 and then comes down to 60; good enough for me).  Is it right to expect write speeds up to 100 MBps?

 

Bear in mind these speeds were taken while transferring a relatively large file from the PC to the drive and vice versa, and not from a dedicated application. 

 

I have seen many youtubers use an application to test read/write speeds. If anyone can provide a link to download it, that'd be great. 

[HPWebcamAble]

How many files were you transferring? What was the total size?

[I am an SSD]

Just now, HPWebcamAble said:

How many files were you transferring? What was the total size?

It was just a .MP4 file, with a size of 3.84 GB

[SeeingSharp]

Flash Drives were never really consistent, for me anyway. Here's one of the HD read/write tests used http://crystalmark.info/software/CrystalDiskMark/index-e.html

[I am an SSD]

8 minutes ago, SeeingSharp said:

Flash Drives were never really consistent, for me anyway. Here's one of the HD read/write tests used http://crystalmark.info/software/CrystalDiskMark/index-e.html

thanks for that

[dhruv1999]

i have the same issue with my hp flash drive. by the way it is usb 3.0 drive.

after few seconds it keeps fluctuating from 12 to 24 mbps i have hitachi 1tb hard disk and no it does not goes to 100% usage while transferring large files.

i was transferring 2.04 gb mp4 file.

and i have attached crystal mark disk 7.0 test results.