https://community.hpe.com/t5/disk/compatibility/m-p/2625400#M1943 Yes, these part are compatible. You shouldn't have any problems mixing these. The only difference with these HDD is that one is 10,000 RPM and the other is 7200 RPM. Thu, 03 Jan 2002 00:00:00 GMT Mark Cloutier 2002-01-03T00:00:00Z https://community.hpe.com/t5/disk/compatibility/m-p/2625399#M1942 I've 3 9.1Gb Wide Ultra SCSI-3 (PN 313706-B21) in my P-1600. <BR />Now I found the same HDD but with another PN 336357-B21. Is it fully compatible with my drive cage and SA-221 Controller? Wed, 05 Dec 2001 00:00:00 GMT https://community.hpe.com/t5/disk/compatibility/m-p/2625399#M1942 Ayman Altounji 2001-12-05T00:00:00Z https://community.hpe.com/t5/disk/compatibility/m-p/2625400#M1943 Yes, these part are compatible. You shouldn't have any problems mixing these. The only difference with these HDD is that one is 10,000 RPM and the other is 7200 RPM. Thu, 03 Jan 2002 00:00:00 GMT https://community.hpe.com/t5/disk/compatibility/m-p/2625400#M1943 Mark Cloutier 2002-01-03T00:00:00Z