Sudden HDD speed drop???

[buri]

hi all,

i have a 4TB WD Red connected to Gigabyte Z370 HD3 board . 2 weird things happened;

 

1- hdd usable space is 3.63 TB shown in file explorer and i copied around 2.3TB to the drive and right now it show 30 GB free space and red bar that hdd is full. I have the same directory (which i copied to the WD RED) sitting on my Seagate Ext Drive and size is 2.3 TB. 

 

2- i didnt a test with CrystalDiskMark 10 days ago when hdd was empty and results were Read/Writre : 188mb/s / 188mb/s

 now i did the same test and i am getting 88 mb/s

 

what is causing these weird issues?

 

tia

 

[Supportsneedlove]

5 minutes ago, buri said:

hi all,

i have a 4TB WD Red connected to Gigabyte Z370 HD3 board . 2 weird things happened;

 

1- hdd usable space is 3.63 TB shown in file explorer and i copied around 2.3TB to the drive and right now it show 30 GB free space and red bar that hdd is full. I have the same directory (which i copied to the WD RED) sitting on my Seagate Ext Drive and size is 2.3 TB. 

 

2- i didnt a test with CrystalDiskMark 10 days ago when hdd was empty and results were Read/Writre : 188mb/s / 188mb/s

 now i did the same test and i am getting 88 mb/s

 

what is causing these weird issues?

 

tia

 

I've heard that drives can slow down when they're more than 50% full, not sure though.

[wojtepanik]

use windirstat to diagnose empty space 

[buri]

7 minutes ago, wojtepanik said:

use windirstat to diagnose empty space 

 

thanks, actually its really full, i just dont understand why windows explorer shows different number when i check the directory size through righlt click and properties...

 

10 minutes ago, Supportsneedlove said:

I've heard that drives can slow down when they're more than 50% full, not sure though.

i just deleted around 350 gb from the drive and did another test and now its around 130 mb/s

[Pixel5]

19 minutes ago, buri said:

i just deleted around 350 gb from the drive and did another test and now its around 130 mb/s

this makes sense, remember whenever you read or write anything there is the read/write head physically moving to the position where it wants to write to, with en empty HDD it can basically write almost anywhere and only has a short distance to cover, if the HDD gets full it will need to move to the next free sector before it can perform the next write operation.