Hello yamauchi1234,

The SKU# that you provided is for a server HDD & not a MD3420.  The Dell part# is 6W3V5 which you can see on this link. https://www.dell.com/en-us/shop/dell-10000-rpm-sas-12gbps-25in-hot-plug-hard-drive-35in-hybrid-carrier-600-gb-cuskit/apd/400-ajph/storage-drives-media

If you look on the support matrix for your MD3420 & you look on page 20-26 we list out all the Dell Part# and that part# is not in the list. https://downloads.dell.com/manuals/common/powervault_md34xx_md38xxif_supportmatrix_en-us.pdf

Please let us know if you have any other questions.