11 Replies Latest reply on Jan 25, 2018 6:48 AM by Intel Corporation

    SSD specifics request.

    PF4Public

      Hi there

      Does anybody have specific information on page size and erase block size of the following SSD drives:

      1. https://ark.intel.com/products/66249/Intel-SSD-520-Series-180GB-2_5in-SATA-6Gbs-25nm-MLC

      Intel® SSD 520 Series

      180GB, 2.5in SATA 6Gb/s, 25nm, MLC

      2. https://ark.intel.com/en/products/94420/Intel-SSD-540s-Series-120GB-2_5in-SATA-6Gbs-16nm-TLC

      Intel® SSD 540s Series

      120GB, 2.5in SATA 6Gb/s, 16nm, TLC

       

      Please note, that I'm not asking about partition alignment etc. I need to know these parameters to optimize my filesystems.

       

      Thanks

        • 1. Re: SSD specifics request.
          Intel Corporation
          This message was posted on behalf of Intel Corporation

          Hello PF4Public,

           

          Thanks for posting in our community.

           

          These details are not part of the technical specifications published for these SSD models. However, we'll investigate if this information is available.

           

          We'll post again as soon as we have updates.

           

          Best regards,
          Eugenio F.

          • 2. Re: SSD specifics request.
            Intel Corporation
            This message was posted on behalf of Intel Corporation

            Hello PF4Public,

            We have updates regarding this post.

            As mentioned before. Page and erase block size are not indicated in the drives specifications. However, the Physical / Logical Sector size could be used to find the Erase Sector Size as shown here. This information can be found in the product specification:

            Intel® SSD 520 Series (page 26)
            Intel® SSD 540s Series (page 24)

            As for the Page Size, we haven't been able to determine its value.

            NOTE: Links to third party sites are being offered for your convenience and should not be viewed as an endorsement by Intel of the content, products, or services offered there.

            Best regards,
            Eugenio F.

            • 3. Re: SSD specifics request.
              PF4Public

              Hi Eugenio

               

              Thank you for your reply

               

              The third party webpage you linked indeed does detail a way of obtaining Erase Sector Size. However examples provided there assume that Linux kernel has access directly to the hardware memory controller, which interfaces flash modules. Moreover hardware memory controller has all the information on flash chips attached to it. What Linux kernel does in those examples is mere pretty-printing this information. With SSD drive attached to motherboard there is no easy way of extracting this information as memory controller is internal to SSD drive and has no external interfaces whatsoever. As a consequence this method of identifying Erase Sector Size does not apply here.

               

              As for the specifications you attached, the table you refer to describes what information these SSD drives return in reply to ATA IDENTIFY DEVICE command. You mention that it is possible to use "Physical / Logical Sector" word of this specification to determine the Erase Sector Size. According to ATA Command Set this particular field does indicate relationship between Physical and Logical Sector size over the ATA interface. First of all ATA interface is external to SSD flash hardware memory controller and moreover it is mere a ratio quantity and it has nothing to do with internal architecture of the SSD flash.

               

              So thank you for your effort, but it is not quite the information I'm looking for.

              • 4. Re: SSD specifics request.
                Intel Corporation
                This message was posted on behalf of Intel Corporation

                Hello PF4Public,
                 
                Thanks for your inputs.
                 
                We were checking different documents for those models, however Page and Block Size is not present in them. These details are used for design purposes only and are not available to the public.
                 
                Best regards,
                Eugenio F.

                • 5. Re: SSD specifics request.
                  PF4Public

                  Hi Eugenio

                   

                  Thank you for your reply

                   

                  Given that Intel does not disclose Page and Block Sizes of their SSDs to public and having in mind Intel document titled "Partition Alignment of Intel ® SSDs for Achieving Maximum Performance and Endurance", is it correct to assume that Intel considers aligning partitions to 1 MB (per document referenced) by end-user to be sufficient for performance and endurance without the knowledge of Page and Block Sizes, which would enable end-users to configure filesystems on SSDs to arrange data in chunks equal to Block Size to minimise wear?

                  • 6. Re: SSD specifics request.
                    Intel Corporation
                    This message was posted on behalf of Intel Corporation

                    Hello PF4Public,

                    Please allow us some time to investigate and confirm if aligning partitions to 1MB would be beneficial for all SSD models.

                    Best regards,
                    Eugenio F.

                    • 7. Re: SSD specifics request.
                      Intel Corporation
                      This message was posted on behalf of Intel Corporation

                      Hello PF4Public,
                       
                      We have updates regarding your inquiry.
                       
                      The information on the partition alignment document is intended for Intel® SSD Data Center family, not consumer drives such as the Intel® SSD 540s and 520 Series. However, your drives have a similar structure and the recommendations there could apply to them as well.
                       
                      I was able to get authorization to share the page size for the Intel® SSD 540s, which is 16KB. As for the Intel® SSD 520, this is a legacy drive and available information is limited. Both drives sector size is 512 bytes.

                      Best regards,
                      Eugenio F.

                      • 8. Re: SSD specifics request.
                        PF4Public

                        Hi Eugenio

                        Thanks for your reply.

                         

                        For anyone interested actual information follows:

                        I have tried flashbench on both devices and it seems that they both use 4K page size as there was no noticeable measurements' differences above 4K.

                        Also I have unscrewed my 540s Series SSD and identified that it uses one 256MB RAM chip and four of H27QEG8NDM5R chips, which per SK Hynix datasheet have a 4MB Block Size.

                        As for the other SSD - didn't unscrew it just yet.

                        • 9. Re: SSD specifics request.
                          Intel Corporation
                          This message was posted on behalf of Intel Corporation

                          Hello PF4Public,
                           
                          Thanks for sharing this information, it is good to know you were able to find these details.
                           
                          However, please bear in mind that we don't recommend unscrewing your Intel® SSD. Doing so voids the device warranty.
                           
                          Best regards,
                          Eugenio F.

                          • 10. Re: SSD specifics request.
                            PF4Public

                            Hi Eugenio

                            Thanks for your reminder.

                            The documents you linked indeed state warranty voiding conditions, however some jurisdictions do not allow voiding warranty after unauthorized disassembly which did not cause product malfunction and their ruling prevails.

                            I didn't do any damage to my SSD, so I feel safe in this regards.

                            • 11. Re: SSD specifics request.
                              Intel Corporation
                              This message was posted on behalf of Intel Corporation

                              Hello PF4Public,

                               

                              Thanks for you reply.

                               

                              As you mentioned, some of the clauses on the limited warranty may not apply to you depending on the country or place jurisdiction. However, we still don't recommend remove or damage the label as it will void the warranty for most users.

                               

                              Best regards,

                              Eugenio F.