Storage : IDE-SATA-M.2 PCIe Gen4

 Protocol and its speed

PCIe Gen4 is the latest available from AMD platforms. 4.3 GB/s is the average read speed.

1 bit = 0.125 Byte (1bit/8)

8 bits = 1 byte

6Gb/s = 6000Mbits/s = 6000/8 = 750 MB/s

IDE		133MB/s
SATA I	1.5 Gb/s	187.5 MB/s
SATA II	3 Gb/s	375 MB/s
SATA III	6 Gb/s	750 MB/s
M.2 SATA 3.0		600MB/s
M.2 PCIe Gen 2x2 lanes		1000MB/s
M.2 PCIe Gen 2x4 lanes		2000MB/s
M.2 PCIe Gen 3x4 lanes		4000MB/s
M.2 PCIe Gen 4x4 lanes		8000MB/s

Few storage average r/w speed and its access time. Data captured in Ubuntu 18.04 Disks Benchmark.

		Average Read Rate MB/s	Average Write Rate MB/s	Average Access Time msec	Part#
1	SSD-SATA3.0	367 137	308	0.22 0.19	Samsung SSD 840 EVO 120GB - EXT0BB6Q
2	SATA 3.0 -2.5inch	89.6	48.8	17.87	-ST1000LM035 2.5inch seagate 1TB
		74.1	50.1	15.15	WD5000LPVX-22V0TT0
		90.4	80.2	17.3	- TOSHIBA MK2552GSX 250GB - LV010J
	SATA 3.0 3.5inch	113.4	73.4	15.18	-ST500DM002 7200 16MB CACHE
		151.1	113.3	14.36	-ST2000DM001 7200 64MB CACHE
		221	220		Seagate Barracuda Pro 4TB 128MB CACHE
		199	189		WD Black 1TB 64MB CACHE
3	USB 3.0 Mass Storage	140.2		0.73
4	USB 3.0 SATA	81		25.46
5	NVme SSD PCIe Gen3	2.2 GB/s	1.6GB/s	0.18	WDS500G2B0C R- 2400MB/s W-1750 MB/s
6	NVme SSD PCIe Gen4	4.3GB/s		0.06	-Corsair Force MP600 500GB

Corsair MP600 M.2 PCIe Gen4 data captured using AMD Ryzen 5600X - MSI x570 MAG TOMAHAWK WIFI , Corsair VENGEANCE RGB PRO PC4-25600 (3200MHz) 2 x 16GB 

In 3.5inch HDD , WD Black 4TB or Seagate Barracuda Pro is best considering it's warranty, price.WD is slightly higer price range compared to Seagate

	Interface (Gbps)	Capacity (TB)	Cache	RPM	Price	Model Number	Warranty years
Seagater Barracuda		2	256 190	5400	4480	ST2000DM005	2
		1	64 210	7200	7800	ST1000DM010	5
Seagate Barracuda Pro		2	128 195	7200		ST2000DM009	5
		4	128 220	7200		ST4000DM006	5
		6	256 220	7200		ST6000DM004	5
Western Digital Black		6	256 227	7200		WD6003FZBX	5
		4	256 256	7200	17500	WD4005FZBX	5
		2	64 164	7200	9300	WD2003FZEX	5
		1	64 150	7200	6000	WD1003FZEX	5
WD Blue SSD		4	560/ 530MB/s	600TBW 95k/82k IOPS			5
		2			20000		5
		1			12000
WD Green SSD		2	545MB/s		17500		3
		1			8000		3