Black Magic Disk Speed Test

macuser1232

macrumors 6502a
Original poster
Jan 20, 2012
666
3
Hi, I just recently got the Black Magic Disk Speed Tester and I got around 60 megabyte readings for writing and reading. Is this slow? I'm on a Early 2011 13-inch MacBook Pro i5 processor with 8gb of ram. I know this is only for my hard drive but I just wanted to tell you my specs.
 

Intell

macrumors P6
Jan 24, 2010
18,883
372
Inside
Yes, but do note that Black Magic Disk Speed Test has been giving incorrect results based on its feedback and my own general use of it.
 

Intell

macrumors P6
Jan 24, 2010
18,883
372
Inside
Age, limits of technology at the time, damaged cable, failing hard drive, heat damaged hard drive (130F+), bad controller, poorly written controller drivers, bad drive firmware
 
Nov 28, 2010
22,684
27
located
hm. So what causes a slow hard drive? I am really interested to know.
As already noted, BMST sometimes reports inaccurate numbers.
To confirm, that you have a slow HDD, first use the two other applications linked to in post #2 to verify the numbers BMST gave you and then open System Report > Hardware > Serial ATA > to find out your HDD model.

 

macuser1232

macrumors 6502a
Original poster
Jan 20, 2012
666
3
Age, limits of technology at the time, damaged cable, failing hard drive, heat damaged hard drive (130F+), bad controller, poorly written controller drivers, bad drive firmware
Well I don't think my hard drive or computer fits any of those. So can I compare my schools with anyone? I am a little concerned about my hard drive's speed(etc.).
 
Nov 28, 2010
22,684
27
located
Well I don't think my hard drive or computer fits any of those. So can I compare my schools with anyone? I am a little concerned about my hard drive's speed(etc.).
Post #3 and #6. And as mentioned, modern HDDs offer 70 to 100 MB/s, depending on model (post #6). Most of my 500 GB HDDs are 5,400 RPM models and get 75 MB/s via a direct S-ATA connection, my Momentus 7200.4 has 7,200 RPM and gets 95 to 105 MB/s.
 
Nov 28, 2010
22,684
27
located
I actually have a 320gb hard drive.
Which will probably be a 5,400 RPM drive, thus a speed of 70 MB/s should be alright. Maybe those other two applications I linked to can verify that. Or the exact model number and a quick www search for benchmarks of that drive can do that too. Or not.
Why doesnt AJA let me benchmark my native rMBP SSD or any installed HDD/SSD on my 13" MBP, only external drives?
That seems to be a bug, as I sometimes have the same problem, though restarts seem to fix that, sometimes. Btw, I am using 10.6.8 on both my Macs with both having an SSD and one having an additional HDD.
 

macuser1232

macrumors 6502a
Original poster
Jan 20, 2012
666
3
Hm Ok. Yeah the black magic disk speed test gave me pretty low speeds but the Xbench gave me around normal speeds like 70(if I read correctly).
 

hfg

macrumors 68040
Dec 1, 2006
3,568
277
Cedar Rapids, IA. USA
Why doesnt AJA let me benchmark my native rMBP SSD or any installed HDD/SSD on my 13" MBP, only external drives?
Do a "Get Info" on your installed drive, then, at the bottom, unlock and add yourself to the list, making yourself read/write capable. Then try the test again and it should work.



-howard
 

robvas

macrumors 68030
Mar 29, 2009
2,911
417
USA
Hm Ok. Yeah the black magic disk speed test gave me pretty low speeds but the Xbench gave me around normal speeds like 70(if I read correctly).
Different parts of your HD are going to be faster or slower than others.



80-40MB/s depending on whether you are using the inside or outside of the drive.
 

hfg

macrumors 68040
Dec 1, 2006
3,568
277
Cedar Rapids, IA. USA
Same thing, doesnt let me run the native SSD :(
Hmmmm ... that is very strange. This has worked for every system that I have wanted to run the AJA disk test on the built-in system drive.

If, after setting your permissions for the drive, you again select to view the drive info on that drive ... do you still see your login name with read & write permissions in the sharing/Permissions table at the bottom. It may also say "you have custom access" just above the table.


-howard
 

cvcjebus

macrumors newbie
Jun 11, 2013
2
0
Post #3 and #6. And as mentioned, modern HDDs offer 70 to 100 MB/s, depending on model (post #6). Most of my 500 GB HDDs are 5,400 RPM models and get 75 MB/s via a direct S-ATA connection, my Momentus 7200.4 has 7,200 RPM and gets 95 to 105 MB/s.
My 2009 MB has a 500GB 5400RPM drive and yes it does achieve around 75 MB/s, my problem is that my 2011 27" iMac 1TB@ 7200RPM is getting between 65-80 MB/s I can't find any helpful information on the topic so far. any thoughts?