hard disks all manufacturers hdd 2.5" and 3.5" uses what type technology memory for store firmware/bios?
They use non-volatile memory so when the power is off, there is no loss of data.
eprom, eeprom, flash nand, flash nor, rom, serial? what chip?
What I find it is non-volatile memory stored on magnetic disks. They are not considered in the options you provide.
Hi @kesadav882 this depends on the manufacture, most contain a mcu with it’s own mask rom, plus some sort of non-voltate storage used for unique id, firmware, and possibly future updates.
For the average consumer, consider it a locked firmware.
What is the reason for your question? Such that we can better answer you.
Regards,
The reason is to find out the type of memory because depending on the chip where the bios/firmware is allocated, data retention is greater or lesser
I have 3 units 2.5" Seagate, WD Blue, HGTS HDDs
“It depends”
The question has to be answered on a model by model basis, and even then, a revision may (or may not) change the MCU, Memory IC, or Program Therin. We will not have a detailed response to this question.
The only guarantee with Spinning Hard Drives, they will eventually fail. They are more reliable when turned on as the bearings get lubrication. If they sit, un-plugged, the bearings don’t move, so they dry up.
Safety of your Data, really comes down to a few options. How bad do you really need to save it, and how much do you want to pay $ for access.
Today in our always online world, it’s easiest to pay a 3rd party to host your data. Then build and host your own data storage.
Regards,
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What is the maximum number of days, weeks or months that I can keep an HDD without power without risk of damage to the mechanical bearings and motors?
Sorry, that is something we are unable to answer. Your best bet to contact the manufactures of hard-drives and companies that study the reliability.
Regards,