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Hi, the original hard disk in my iMac (late 2009) went very slow. Blackmagic Disk Speed Test from Apple's App Store showed read/write of about 35 MB/s.
So I changed it to a new HD (1TB, non-SSD) – but this is not at all speedier. Same 35 MB/s.
What can I do?
iMac, OS X 10.11
It has a SATA2 3 Gb/s Interface, but not all devices handshake properly, one scenario...
HDD: Do you speak SATA 3?
Mac: No idea what you're talking about.
HDD: OK, let's start at the bottom, do you speak SATA1?
Mac: Yep. 1.5 Gb/s is fine with me.
HDD: OK, 1.5 Gb/s it is.
It has a SATA2 3 Gb/s Interface, but not all devices handshake properly, one scenario...
HDD: Do you speak SATA 3?
Mac: No idea what you're talking about.
HDD: OK, let's start at the bottom, do you speak SATA1?
Mac: Yep. 1.5 Gb/s is fine with me.
HDD: OK, 1.5 Gb/s it is.
Sorry for choosing the hard way…
But: Is there something like spontaneous remission on iMacs? It's quicker (not too quick) since I have cleared the PRam, and then I made the desktop "empty", i.e. put all files there in the Documents-Folder.
And: The new harddisk in my computer is a Toshiba P300 (1TB).
Thank you in advance for answering,
best regards
Jörg
Delete this file & restart...
~/Library/LaunchAgents/com.apple.CSConfigDotMacCert-***@***-
~ tilde indicates hidden Home Library.
Apple hid the Users' Library folders...
Method 1:
Method 2:
4 Select Library from the Go menu (while holding down Option) to access the hidden folder.
Where is it slowest at?
Normally 4GB of RAM is too little, but at the report time it wasn't short of RAM
You can save us asking dozens of questions by submitting a report...
EtreCheck is a simple little app to display the important details of your system configuration and allow you to copy that information to the Clipboard. It is meant to be used with Apple Support Communities to help people help you with your Mac. It will not display any personal info.
Pastebin is a good place to paste the whole report if you capture the URL while there…
Workable but harder for me to work with...the Note tool on the bottom of this editor's toolbar, as shown in the image, to copy and paste the output from EtreCheck. In a Reply before you click post, look for this to add longer texts...
One more thing: your hard drive.
The iMac 10,1 has a 3GB/sec SATA hard drive bus. This from MacTracker:
The current drive is rated at half that speed:
That sorta wastes the nice 7200rpm performance of that drive because your read writes speeds are half what they would be with a 3GB/sec drive. Matching the drive SATA speed to the 3GB/sec bus speed would double your read/writes to, based on that EtreCheck report says for drive peformance, about 140MB/sec.
It worked!
It was remarkably very slow at:
• showing content of mails in Apple Mail program
• showing the content of Applications folder (especially that one!!)
• reaction to keyboard-input after starting of programs like Firefox
• starting programs like Indesign CS3 and Affinity Publisher
Sometimes it seemed like "freezing", sometimes I saw the beachball. Now it seems to be quicker, but there still is a certain delay… but I can live with that. I'll keep watching and will write again.
I have ordered another 8GB of RAM. Can I put all RAM in the iMac? Actually there are two 2GBs in two sockets, can I just add the newly bought two 4GBs in the other two sockets?
As far as I understand the linked Toshiba spec-sheet, my HD is able to deal with a SATA 6 GB/s controller.
And as far as I understand the Etrecheck-Report of my machine, my iMac seems to have a SATA 1.5 GB/s controller?!
Aha! Got it. And I can imagine there is no way to convince Mac and HDD to start a new and more productive dialogue… Or?
Just in case: If I would start thinking about changing the HDD again, which SDD would be happy to handshake in a perfect friendly manner with my iMac? How about Crucial MX500 with 500GB?
Well, an SSD would be much faster because Seek times are near 0 ms, & seek times take up about half the time or more of the transfer. :)
My 2011 iMac Sata 3 6 Gb/s...
Intel 6 Series Chipset:
Vendor: Intel
Product: 6 Series Chipset
Link Speed: 6 Gigabit
Negotiated Link Speed: 6 Gigabit
Physical Interconnect: SATA
Description: AHCI Version 1.30 Supported
ST2000DM008-2FR102:
Capacity: 2 TB (2,000,398,934,016 bytes)
Model: ST2000DM008-2FR102
Revision: 1
Serial Number: ZFL1YMVJ
Native Command Queuing: Yes
Queue Depth: 32
Removable Media: No
Detachable Drive: No
BSD Name: disk0
Rotational Rate: 7200
Medium Type: Rotational
Partition Map Type: GPT (GUID Partition Table)
S.M.A.R.T. status: Verified
In the olden days I did have some info on Negotiated speeds, even OWC 6 Gb/s SSDS cant run on some Macs @ 3Gb/s because of the handshaking, they run @ 1.5 Gb/s, 0the SATA2 3 Gb/s SSDs will negotiate 3 Gb/s, same problem on Old G5 Power Macs some HDDs could not/would not do the 3 Gb/s speed, only 6 which the G5 could not do or 1.5 Gb/s though supposedly both could do 3 Gb/s if just sit down & talk about what they had in common.
Oh, almost forgot, I have a WD Blue 2 TB SSD in my Mid 2010 Mac Pro, not that it handshakes the same as yours does, but...
Intel ICH10 AHCI:
Vendor: Intel
Product: ICH10 AHCI
Link Speed: 3 Gigabit
Negotiated Link Speed: 3 Gigabit
Physical Interconnect: SATA
Description: AHCI Version 1.20 Supported
WDC WDS200T2B0A:
Capacity: 2 TB (2,000,398,934,016 bytes)
Model: WDC WDS200T2B0A
Revision: X61190WD
Serial Number: 192281800218
Native Command Queuing: Yes
Queue Depth: 32
Removable Media: No
Detachable Drive: No
BSD Name: disk0
Medium Type: Solid State
TRIM Support: No
Bay Name: Bay 1
Partition Map Type: GPT (GUID Partition Table)
S.M.A.R.T. status: Verified
Finally I found out about the SMC Reset, that initiated new negotiations between HDD and Controller. The result:
NVidia MCP79 AHCI:
Hersteller: NVidia
Produkt: MCP79 AHCI
Link-Geschwindigkeit: 3 Gigabit
Ausgehandelte Link-Geschwindigkeit: 3 Gigabit
Physischer Verbindungstyp: SATA
Beschreibung: AHCI Version 1.20 Supported
TOSHIBA HDWD110:
Kapazität: 1 TB (1.000.204.886.016 Byte)
Modell: TOSHIBA HDWD110
Version: MS2OA8R0
Read/write and start sequence is much quicker now. And with a new HDD and the upgrade from 4 to 12 GB Ram and with the help found here (THANK YOU, BDAqua!!) it feels like having a new Mac. :)
Yes you can, & 8 more GB should make a big Diff. :)
Right! Someone should have told me before, that it's such a big difference. :)
Hi Allen,
according to the spec sheet there should be a SATA 6GBit/s interface.
https://www.bueromarkt-ag.de/bilder/produktdatenblaetter/216707.pdf
Is there a difference I don't understand?
SATA 6 Gb/s interface is the upper limit, many drives cannot achieve that, especially 2.5" drives & ones less than 7.200 RPM.
Hard disk slow – what' wrong?