This is a USB 3.1 gen 1 pendrive.
The Read speed when you intially start copying is 150 MBps ( given that the pendrive is not hot) after a few second it goes down to like 130 range and then it goes further down to 100 and then settles at 90 MBps.. This is due to the pendrive getting heated up due to usage. All this happens within a min or 2 depending on if you were using it just before or if you just started using ( i.e. the pendrive is not hot).
The write speed follows a similar trend and tops at 55 MBps and after a couple of seconds it goes to 30 MBps range and then it goes to 22 MBps range where it settles down. You get 22 MBps consistent write speed.
The pendrive doesn’t get ridiculously hot or something. It gets warm and is on the hotter side.

Final verdict: you can buy this unless you find something with better consistent speeds. Don’t buy it after seeing benchmark scores and specs. This is what you’ll actually get.

IMPORTANT: GET THE DRIVE AUTHENTICATED AND VERIFY ITS WARRANTY ONCE YOU RECEIVE THE ITEM.
I sent the product number, pictures, amazon invoice and other details to Sandisk to verify Warranty and product authenticity.

They confirmed, it’s authentic and has 5 YEARS of Warranty. (See the attached picture for their response.)

The manufacturing date shows May 2020. (So, I thought it might be using latest technologies)

Opened the drive in Windows 7, it was snappier. Opened the software directory and READ speed was supremely good.

Then started testing WRITE speed and tried to copy around 6GB of video I downloaded from Youtube. The speed started from 32 MB/s and reduced to 14 MB/s and then, 11 MB/s. (See attached pictures). So WRITE SPEED is too slow to be considered for buying.

CONCLUSION: If it’s capacity is so much (233GB writable) but speed reduces to single digit over write time, what’s its use ? Read the product description details carefully (especially, READ & WRITE speeds, capacity etc) before buying storage devices.

I have noticed that there are many Complaints and Critic Reviews about USB Pendrives, Out of which these two are very common which I have encountered: (Please follow the solution given below if you encounter such issue)
This solution is for Windows Users only: (P.S: I myself have Windows machine)

Q1. Can’t copy large files (> 4GB) to USB flash drive even if it has enough space?
Solution: If you experience such a problem, most probably it’s caused by the fact that your external drive or card is formatted with the FAT32 file system. This type of a file system has a built-in limitation on the size of the files that it may contain. Follow these steps to Fix the File System to NTFS (For Windows user).
i. Attach the external flash drive to the computer, wait for Windows to recognize it and assign a new drive letter to it.
ii. Take a backup of the files present in USB drive if you need.
iii. Go to This PC or Computer folder > Right click on the icon of USB Drive you want to fix
iv. Select ‘Format’ from the menu, and then the select NTFS in the File System drop-down list. Also, you may want to select the Quick Format option, which should speed up the formatting process quite considerably.
v. Press Start, and Windows should warn you about erasing any existing information on the drive. Press OK.

Q2. Even after buying USB 3.0 Pendrive are you observing slower write speed?
Solution: Windows by default isn’t configured correctly to get these high write (copying) speed.
Essentially there are two options for this setting, one enables caching and requires (or highly recommends) you select the “safely remove hardware” option in the taskbar before unplugging it, and the other which you can simply unplug at will. The latter is the default setting, and leads to severely crippled transfer speeds.
Before implementing this option, keep in mind that you will want to start using the eject option when removing your USB device. To do so, simply right click the USB device icon in the menu bar and select “Eject mass storage device.” This will prevent any potential issues with losing cached data.
Ok, now that we covered that, let’s move on to the solution!
i. Click the Windows icon (start menu), search for and open the Device Manager.
ii. In the Device Manager, expand Disk Drives to find your USB device > Right click on the device and select Properties.
iii. In the Properties window, select the 2nd tab called Policies and you will see two options. Most likely if you are experiencing slow speeds, it is set to the default Quick removal.
iv. Simply switch the setting to Better performance and select OK.
You will probably be prompted to restart the computer, and after you do, you should start to see substantially faster transfer speeds!
IF YOU FIND THIS HELPFUL DO MENTION! Have a Nice Shopping!!

Size is 114 GB not 128 GB.