HDD VS SSD VS SSHD speed / throughout
| Type | Speed r/w (sequential) | IOPS (random)read (industry level) | iops writes |
| SSD | 500 mb to 6gb/s | 98K* | 90K* |
| SSHD | NA 200* | ||
| HDD | 100-160 mb/s | 100-400 IOPS |
256 gb ssd = 4tb hdd “(16x) = $160
HDD Speed Rpm: 65K to 72K Rpm
SSHD = ssd+HDD
SSD Throughput, Latency and IOPS
Latency:
storage device to start an IO task called latency
IOPS:
how many Input or Output (IO) operations can be performed by the storage device every second, or IOPS
The greater the number of IOPS, the better the performance.
Speed /Throughput :
The speed at which data is transferred out of or into the storage device is measured in Megabytes per second.
SSD types SATA vs M.2 SATA vs M.2 NVMe
SATA 3 SSD
AHCI Protocol
speed 500 MB/s
Read
write
m.2 sata
speed 500 MB/s
AHCI protocol
Laptop need to have seperate b or bm key in laptop (check if your laptop has that otherwise go for sata 3 )
M.2 NVMe protocol nvme max 4 gb /s
requirements: pci express gen3x4,
nvme support on bios
* Leverage BarraCuda durability with 1.8M hours MTBF
* IOPS – Random Read (Max IOPS , 4KB QD32) – 90k, Random Write – 90k
* Transfer Speed – Max. Sequential Read Speed 560 MB/s and Write 540 MB/s
* SATA 6 Gb/s interface for optimal performance and compatibility with your PC or laptop
Sequential reads/writes up to 560/510 MB/s and random reads/writes up to 95k/90k on all file types
wd
* Reliability: Up to 1.75M hours
* Maximum Read Operating: 3000mbps and 3800 maximum write operating
Western Digital WD Green 240 GB 2.5 inch SATA III Internal Solid State Drive
2,429.00
Western Digital WD Blue 250 GB 2.5 inch SATA III Internal Solid State Drive
₹ 3,739.00
Western Digital Blue SSD 500GB Internal Solid State Drive
5,499.00
using ssd as boot disk. called sshd
Samsung 860 EVO Series 250GB M.2 SATA Internal Solid State Drive (
* Sequential Read/Write Speeds : up to 550/520 MB/s, Random Read/Write Speeds (QD32) : upto 98K IOPS/90K IOPS
Seagate 500GB SATA Laptop Hard Disk HDD
1,549.00
5400 RPM spin speed, 16 MB cache buffer
Comparing IOPS for SSDs and HDDs
* Model: Western Digital VelociRaptor 2.5″ SATA hard drive
* Rotational speed: 10,000 RPM
* Average latency: 3 ms (0.003 seconds)
* Average seek time: 4.2 (r)/4.7 (w) = 4.45 ms (0.0045 seconds)
* Calculated IOPS for this disk: 1/(0.003 + 0.0045) = about 133 IOPS
an 80x improvement
50/50 workload ratio of read/write and 12 drives in the array, for a RAID 6 configuration the usable capacity would be 4.7 TB—and the I/O performance would be 429 IOPS. A RAID 5 configuration would be the same usable storage, but IOPS increases to 600 (thus the meaning of the term “RAID Penalty”).
Apply the same configuration in terms of the same number of SSD drives, the same total usable capacity and a 50/05 workload, and the IOPS climb to 34,286 for RAID 6 and 48,000 for RAID 5. That is nearly an 80x increase at RAID 5 and RAID 6 over the HDD.
processor ram iops vs ssd vs hdd Throughput / speed
ghz 2ghz 1ghz = 1 billion cycles per second (cycles=wave updown)
gb 2gb
ssd 500 600 mb
hdd 100 -150
The HDD’s Read Access Time of 15.785 millisecond sounds quick, and it is, but the SSD’s Access Time of 0.031 milliseconds is 509 times faster!
HDD vs SSD vs SSHD Price
| Type | SIze | Price /laptop | price/desktop |
| SSD | 256 gb | 2.2 to 3.k | 480 gb 4k |
| SSHD | 1 tb | 6 to 7k | 4000 inr * |
| HDD | 1tb | 2.5 to 4k | 2-3k |
SSHD 1 tb =6000 (equals 256gb SSD 2k-3K 1 TB SSD -3k*)
Downside of SSHD is = AI based allocation of data in a small built in SSD (no user request allowed)
ssd vs hdd reliability
Hard drives with moving parts they will die eventually, they give warning signs like I if your hard drive is making clicking noises.
SSD:contain no moving parts
MTBF (mean time between failures) i
a hard disk drive may have a mean time between failures of 300,000 hours, while an SSD might have 1.5 million hours.
TBW — Terabytes written is the total amount of data that can be written to an SSD before it is likely to fail. here are the
Samsung 860 EVO 256 gb SSD: 150 TBW
P/E cycles — data erased, and then rewritten. between 500 to 100,000 P/E cycles.
How to use HDD & SSD Together in laptop & desktop
use 2nd Laptop CD ROM to insert 2nd HDD.
for this buy ssd with hard drive caddy for laptop
SATA 2nd 2.5” Hard Drive Caddy For 12.7mm :
SATA 2nd 2.5” Hard Drive Caddy For 9.5 mm :
for this find dvd drive height: go device manager >> find dvd model>> search specs.
Clone c drive which has windows pre installed, using mini partition tool wizard software
Go to bios settings select primary boot device as ssd.
after boot up format hdd data.
https://www.amazon.in/gp/product/B01ED1SISM/
use ssd for regular application, hdd for storing movies and files. if you are using edit purpose make sure to bring to ssd for faster read & writes.