Adding Seagate HDD to QNAP 469urp with WD RE RAID 5 Hard disks

[mzbcracker]

hi.
i have a QNAP 469URP and i have RAID 5 configured for my WD3000FYYZ (WD Re) HARD Disks.
now one of WD Disks give me error.i want to replace it.but i can not find it.in the website i have found hard disks that are compatible with QNAP 469URP.one of compatible hard disks is Seagate ST33000650NS and ST3000NM0033.
can i use one of these two Seagate Hard Disks and use it with WD Disks That use RAID 5 ???
could you please help me??

[Don]

You can use any drive that is on the compatibility list that is the same size or larger.

[mzbcracker]

thanks for the reply
what if the cache of the Hard Disks are different but the RPM of Hard Disks are the same.
Here's the part Number of disks:
Western Digital WD3000FYYZ: 7200 RPM - 64 MB Cache
Seagate ST3000NM0033 : 7200 RPM - 128MB Cache

my current disks are Western Digital and i want to remove one of them and put a new Seagate Hard disk

[Don]

You can use any drive that is on the compatibility list that is the same size or larger.

Also note the speed of the array will be based on the slowest drive in the array.