SSD portion of hybrid drives
I thought the SSD portion of a hybrid drive was generally from 4-128 GB. Why are they being listed all over with statements about cache in MB (three orders of magnitude smaller)? If that is something different, why is the SSD size not listed?
Newegg lists one; most listings state the RAM cache but not the NAND cache/SSD size. What is up with that?
The St1000lm014 has 8gb nand. There are a few models that have 32gb.
Thanks for the doc. Any pointers to the 32Gb NAND drives?
I seem to remember some discussion re 64Gb NAND hybrid drives and larger (Don't remember where). Maybe someone will design a routine to log, analyze, and profile caching patterns. But, until various user groups are sampled, some will buy too little NAND, and others will buy more than they need.
" Any pointers to the 32Gb NAND drives? "
Anyone using a hybrid drive? Seagate Momentus drives are apparently popular lately, but what about the Western Digital models (different system, I read)?
I am thinking about a 500 GB drive: What model is recommended (brand and #)? What size is the NAND ram?
Regarding Seagate switching to 5400 rpm for the spinning portion: Do they choose that because it is faster to spin up to 5400 rpm compared with 7200 rpm (while letting the NAND portion do the speedy caching)?
If one tends to save open files frequently, in case the machine or program crashes, will this significantly use up the SSD life (using write cycles)? Imagine working frequently in some spreaadsheet files and saving frequently.
I like the Seagate strategy to encourage letting the firmware manage what and when goes to the HDD and what and when goes to the SSD. It sounds like WD will allow (require?) more interaction, but it seems best to use some automatically tuning algorithm. Any thoughts on this?
Both had 32gb nand but really, at that much nand just get the readycache ssd and use whatever hdd you want.
This is an marketing issue! They use cache to replace buffer in datasheet which looks more advanced.
Usually, the cache (usually size between 8MB to 64MB) are buffer which provides read-ahead and read-behind buffering. The SSD cache in SSHD is firmware-based cache focus on sector-track. The file cache managed by operating system or those need a drive focus on files. You may use a file but doesn't need to read the full file content. that's what firmware-based and software-based cache different.
There is an explain on Buffer and Cache in Hard Drive and Operating System explains the SSD Cache Size of your SSHD shall help you to understand the internal story and size matters.