On 13/12/2017 15:55, Greg Freemyer wrote:
Long ago I knew more about the chips. We used to refer to DRAM for dynamic ram. The bits in the DRAM chips would disappear in a few seconds (or less) of the data wasn't refreshed by a strobe.
It is clear that NVMe SSDs don't use DRAM chips, but could one call the chips they use RAM, I don't know. I'm sure they have the internal erase block (EB) feature/architecture of SATA interfaced SSDs.
The EB architecture means the data once written is stable until electricity is used to erase a block of memory for re-use. There is a controller that lives on the SSD that manages the EB allocation and sector mapping from a logical sector to a physical EB and internal EB offset. To me this is nothing at all like what I think of when I see the term RAMDISK.
Greg It's official, the nand flash chips used by ssds and nvme disks are block readable and writable only, so they can't be classed as random access memory which every location from address 0 and up is accessable in a random fashion. Dave P
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