The warranty-issue was a key factor when deciding on what disks to buy.
Most buyers in the world forget about one key problem with warranty disks. If the HDD failed, it does not mean that the data written on it is inaccessible on special equipment. Therefore, you still cannot return the warranty disk if you did not encrypt all the critical data on it.
It is even worse with SSDs - they often go into "read only" mode when they fail - you can read part of the undamaged data, but you cannot delete it. And even if the disk is no longer detected in the system, on the manufacturers' equipment you can read most of it directly from the NAND chips. You cannot return such a disk to the seller or the manufacturer. With your data. And what is the point of a warranty if you do not encrypt the data, if it is personal? Encryption is not necessary if something on it is not personal information. But more often than not, the technically illiterate majority of the population does not even think that they are handing over their private data to sellers/manufacturers in huge quantities, thinking that if the disk failed and is not detected, the data is lost. But this is not so. And there are a lot of buyers who return SSDs that are locked in "read only" mode with their personal data. But this is of course their personal problem - leakage of this data to 3rd parties...
Therefore, the warranty is only important if the disks do not contain critical personal data or all partitions with such data are encrypted. Otherwise, you will not be able to use the warranty anyway.
SSDs have a shorter write lifespan and I plan to tinker with personal AI projects which would need lots (really lots) of writing. Also, SSDs seem to have short-lived data retention when powered off for long periods of time due to imperfections in the transistor insulator gate, so I'm worried they wouldn't retain data when resting inside a drawer for years just like HDDs can (i have two really old 3.5" backup HDDs resting in drawers, and they still hold the data I stored inside them several years ago; when I buy another PC in the foreseeable future, I'm certainly going to turn the current HDD into another redundant backup, so I'm planning for that, too, when seeking for HDDs).
860 Evo Pro - 3D MLC, they are still available for sale. The data storage period is more than 10 years with wear less than 10%.
3D TLC really has a bad data retention period. I have an 860 Evo (one of the most reliable Samsung series) where files haven't been rewritten for 2-3 years - the reading speed has already dropped 8-10 times.
I have Transcend flash drives with MLC and TLC (they quietly replaced the flash with a cheaper one) of the same series - 2 of them lay on the shelf with recorded data for 3 years. After checking, it turned out that the one with MLC lost only 20-30% of its peak reading speed in 3 years. The one with TLC lost up to 90% of the reading speed. Thus, the MLC flash will lose 90% of the reading speed no earlier than 9-10 years. And this has already been proven with flash drives from the early 2000s - data is stored on them for 10-13 years without problems, but they have a very old planar MLC - very reliable...
There is no place for HDD in a laptop - they have become very dependent on the slightest vibrations and they are all noisy. And models from 2TB are still on monstrously slow SMR technologies, and not like before on CMR/PMR. Therefore, you were correctly advised - buy, for example, a server Toshiba MG series for 8-12TB (without helium) and put it in a USB case with good cooling. For operational backup of data from all your SSDs in the laptop(s). At least once a week. And once every 1-2 months, rewrite the backups to a second similar copy for 8-12TB. The rest of the time they should lie turned off. The most valuable data should be backed up immediately to NAS (there may also be SSDs there - in RAID10), and then copied from it to these two disks, since you should always have at least 3 copies.
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