0
\$\begingroup\$

Today's memory devices have a lot of logic embedded before data is actually written onto the NAND pages. An example could be wear levelling algorithm , FTL functionalities etc.

The typical life of a NAND cell would be around 100000 cycles of operation.

My question is:

Can the storage devices performance be maxed out if all of the internal logic were removed? (Assuming I dont care what happens after 100000 cycles. I just need speed for 100000 cycles and then, before the end, I would backup and use another storage.)

Are there any such devices out there that allow me to disable such logic?

How practical are such devices in terms of speed improvement (if they exist?)

\$\endgroup\$
1
\$\begingroup\$

To answer your questions in turn

  • "Can storage devices performance be maxed out..." - This very much depends on what you want to do. If you're using your storage as a block device for a filesystem like FAT32 or NTFS. The lack of the FTL will make things considerably slower: Imagine you edit a file and change a "1" to a "2". With an FTL, a spare pre-erased block will be allocated and your new data written there. Without the FTL you'll need to erase the original block, wait for the erase to finish (very slow), and then write the data. The other issue you'll have without an FTL is that you'll need to make the next layer up aware of the bad sectors on the flash. However there are use cases where not having an FTL makes sense (eg with filesystems like YAFFS)

  • "Are there any such devices...": Smartmedia cards are just raw nand flash chips with the pins brought out to pads. But a typical USB smartmedia reader will implement the FTL. However there are/were devices which used them directly.

  • "How practical...": not really practical for the reasons mentioned above. Early android phones used raw nand and YAFFS, modern ones use eMMC with an FTL and (usually) an ext3/4 filesystem.

\$\endgroup\$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.