Question 1

I want to use this to store pictures from my android phone. Is this easy to use? Im not tech savvy at all.

Accepted Answer

No, this is a USB-A thumb drive, the larger port on all computers. Many newer better android phones have USB-C (small, oval shaped). Most still have micro-USB (small, trapezoid). The easiest way to tell the difference is if you can flip your charging cable upside down and it still plugs in then it's C, otherwise it's probably micro-usb. I would google photos of the ports to verify.  Anyway, there are several thumbdrives that have USB-A on one side and USB-C or micro-USB on the other side.   You could also get an OTG adapter for this thumbdrive to plug it into your phone.  I'm not sure what software would transfer your photos to the thumbdrive, but I'm sure there are 1000 different options. The built in photos app lets you select days or individual photos and 'copy to folder' on an external drive. Other software might automate the process by copying them all when you plug in the drive.
Personally I would recommend Android's built in backup&sync. It will upload your photos when you're on wifi. I think it's on by default, so you should go to google's photo webpage (amazon won't allow link), and log in with the same account you use on your phone and see if all your pictures have already been uploaded. If not, it shouldn't be too difficult to find instructions for turning on backup&sync for photos. On mine there's a switch in the photos app when I look in the 'Camera' album. FYI: uploading doesn't mean they're shared. Unless someone takes a great interest (time&money&hacking) they're pretty safe.
Micro-usb:  https://www.amazon.com/Samsung-Flash-Drive-MUF-32CB-AM/dp/B013UHK0TK/
USB-C:  https://www.amazon.com/Samsung-Duo-Plus-256GB-MUF-256DB/dp/B07DW2Q1JL/

Question 2

How hot does this get? That happens to be my main concern as of now with alot of these "low profile" drives, planning to use with a raspberry pi

Accepted Answer

It works great with the Pi. I have one that I use with my Pi 4 and Pi 400, and it doesn't seem to heat up at all. It's also much faster than many other drives floating around.

Question 3

Can I install a Mac OS, option boot On startup and use it as a hard drive?

Accepted Answer

Yes.  I installed macOS High Sierra on it and can start up from it whenever I need to use that OS.  It works great and the speed is fine.

Question 4

What is the default file system formatted as?

Accepted Answer

If you store files larger than 4GB, like video files, FAT32 is old technology that won't store big files. ExFat is much better, no file size limit. If you try to use FAT32 on something that stores video or DVR files, it might not even tell you about the file size limit, it will simply stop recording.

ASIN	B07D7Q41PM
Additional Features	Water Resistant
Best Sellers Rank	#23,747 in Computers ( See Top 100 in Computers ) #264 in USB Flash Drives
Brand	Samsung
Built-In Media	USB Flash Drive
Color	Gunmetal Grey
Compatible Devices	Devices with USB port or USB connection
Connectivity Technology	USB
Customer Reviews	4.7 out of 5 stars 10,680 Reviews
Flash Memory Type	USB
Global Trade Identification Number	00887276265940
Hardware Connectivity Technology	USB Type A
Hardware Interface	USB
Hardware interface	USB
Item Dimensions D x W x H	7D x 24W x 7H millimeters
Item Type Name	Samsung MUF-256AB/AM FIT Plus 256GB - 300MB/s USB 3.1 Flash Drive
Item Weight	0.01 Pounds
Manufacturer	Samsung Electronics DAV
Memory Storage Capacity	256 GB
Memory storage capacity	256 GB
Mfr Part Number	MUF-256AB/AM
Model Name	FIT Plus
Model Number	MUF-256AB/AM
Number of Items	1
Number of Packs	1
Read Speed	300 Megabytes Per Second
Reading speed	300 Megabytes Per Second
Special features	Water Resistant
UPC	887276265940
Write Speed	400
Writing speed	400

SAMSUNG MUF-256AB/AM FIT Plus 256GB - 400MB/s USB 3.1 Flash Drive, Gunmetal Gray

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