Benchmarks - 4 HDD / RAID 6
RAID 6: Extend RAID 5 by adding an additional parity block; thus it uses block-level striping with two parity blocks distributed across all member disks.
HD Video Playback
HD Video Play - 720p HD stream from Windows Media Player* 256kB reads
2HD Video Play - 2x playback
4HD Video Play - 4x playback
HD Video Record
HD Video Record - 720p HD stream, 256kB writes
HD Video Play & Record - 1 playback, 1 record simultaneously
2x HD Video Play & 2x Record - 2 playback, 2 record simultaneously
Photo Album - All reads - wide distribution of sizes
Office Productivity - Reads and writes, 1kB & 4kB reads; Mostly 1kB writes
Content Creation - 95% writes; 1k, 4k & little reads; Writes up to 64kB
File / Directory Transfer
Directory Copy From NAS - 64kB reads
Directory Copy To NAS - Predominantly 64kB writes, wide scattering under 16kB
File Copy From NAS - 4GB file copy, 64kB reads
File Copy To NAS - 64kB writes
Single Client Performance Wrap-up
I haven't reviewed a true consumer level NAS like the TS-421 for a long time.
All of the other units on the single user charts use Intel Atom processors and some even cost twice as much as the TS-421. The 421 delivers a solid user experience at RAID 5 where most users should set the NAS at.
The HD video playback performance of 50 MB/s is strong enough to watch a Blu-ray ISO across the network. The 4x HD playback performance of 40 MB/s means four different TVs can play HD content at the same time, all off of the TS-421.