When not needed properly disconnect it from the USB connection and leave it powered off.
A Hard Drives life is unknown. But it can be treated like a car. When not needing to run shut it off to drastically lower its run time. Run time is like mileage on a car.
i better buy1 laptop and 1 new pc with 3-4 T hdd and save everything there.so this hdd will be useless
You dont want all data in 1 location = 1 drive ... you should have it on multiple drives if you dont want to lose it. Drives will fail, when is unknown, but a pair of drives failing at the same time is about the odds of being struck by lightning or a house fire which would cook both of them. It can happen but far less likely than 1 of 2 drives dying. Right now with 1 external drive your running with all eggs in 1 basket and risky.
Trying to help you to reduce the risk of data loss. Stated a few times you want to use multiple drives and not just one large single drive.
Buying a new laptop isnt needed unless you really need a new one. An additional 1TB or larger drive is all you need to properly protect up to 1TB of data with redundancy = same data stored on both drives.
Now u make me wonder: why i buyed this hdd? )) is not safe not live looong life
Getting back to car analogy, if its kept parked and protected from the environment around it and not used much it can last 20 years or longer because of light use just like a car that isnt run into the ground to failure.
Most people wont have a use for a external hard drive after about 8 years or so due to the fact that 8 years from now that drive will seem small though. For example i have a 10MB hard drive that came out of my 8088XT computer. The Hard Drive is 30 years old and still works, but the most complex application for it would be Windows 3.11 which uses about 9MB of the 10MB leaving 1MB free for data. It has DOS 5.0 on it and some really old DOS games. The 10MB of data off that drive is on a 650MB CD-R with a bunch of other old data going back to the 1980s. When CD Burners got affordable around 1999 I burned all my old data to a single 650MB CD-R made 2 more backup copies of it for redundancy vs a single CD to lose data, and threw away a trash bag full of floppy disks that held 720k or 1.44MB of data each.
Another drive a 4.3GB Quantum BigFoot 5.25" drive that I had since 1996 though failed 6 months ago. It was used a lot and then put into storage and used occasionally. One day I went to use it for a Windows 98 SE system and got the clunk of death.
After reboot after clunk of death the drive no longer spins up, just a solid green LED on the main board that normally would flicker with HDD activity. The drive lasted long beyond its intended life and failed after 20 years.