Can't see new disks

[Alecmascot]

sorry to be pedantic but :
With ANY one disk or just the SAS disks ?
The molex will isolate the 3.3v (pin3).
The pc powered up with all the drives connected before you isolated pin3 ?

 

[Octopuss]

Yes we're still talking about the SAS disks only.
With the pin unisolated the PC powered up, but the disks didn't spin up at all.

 

[c77dk]

The tape you used - is that kapton / kapton style (can't really make it out)?
Otherwise there might be a small risk of making a short circuit, which hopefully causes the system to not start.

 

[Octopuss]

I have no idea what that is.
I just grabbed random black tape I had laying around. There was no contact with the other pins anyway.

 

[Alecmascot]

well, the molex will fix the pin3 power inhibit issue but the SAS drives do not actually use the 3.3v line, so there is an overload on the +5 or +12v.
Did you try with only one disk (sas) connected, no satas. I cannot see from the thread.....

 

[Octopuss]

Overload? The PSU should be plenty powerful, plus I used more than just one cable from the PSU.

I don't think I tried this.

 

[Octopuss]

I did try in my PC though, just one SAS disk, the same cables, pin 3 taped.
Connected, the PSU made a short pfff-crack, and I couldn't power the damn thing anymore for good ten minutes (weird).
I made sure the tape only covered the pin in question, and after reconncting the cable a few times made sure it really stuck in place (so there couldn't be a short.

 

[Alecmascot]

the PSU made a short pfff-crack, and I couldn't power the damn thing anymore for good ten minutes (weird).

Sounds like a thermal trip that resets when it cools. Overload of some sort.
Try all the SAS drives separately.
I doubt that the tape is conductive and likely to cause a short but you could check with a multimeter to be sure. I usually use sellotape as the connector will not be opened/closed very much.

 

[Octopuss]

That would be the same result I guess, one disk was enough.
I'll buy some cheap molex to sata reduction and see what happens.
If it does I guess I'd buy a different cable (with straight up molex connectors), because I don't like the idea of connecting three different cables together.

FFS I didn't think this would be SUCH a problem.

 

[Alecmascot]

Please post the results.
Rgds

 

[Octopuss]

I bought two of these

Took one disk, connected it, and... nothing. Pretty much.
Unlike with the SATA power cable, there is a barely audible small click this time, but the disk (I tried all five) wouldn't spin up at all either.

What the hell is going on?

 

[Alecmascot]

Did you try a sata on the end of that cable ?

 

[Octopuss]

Found one 2,5" notebook HDD. It spins up just fine.

 

[Alecmascot]

Found one 2,5" notebook HDD. It spins up just fine.

does not need 12v.
check for +5 and +12 on the molex.

 

[Octopuss]

Sorry I don't understand.

 

[Alecmascot]

Sorry I don't understand.

THe notebook drives runs off only 5v
The 3.5 inch drives need 5v and 12v
So use a meter to check for those voltages on the molex.
The black wires are grounds.

 

[c77dk]

Are the data-connection connected (since you're testing this weird issue it might have been disconnected to focus on power)? Saw somewhere in the threads about the pin3 issue that some drives want the dataconnection in order to spin up

 

[Octopuss]

THe notebook drives runs off only 5v
The 3.5 inch drives need 5v and 12v
So use a meter to check for those voltages on the molex.
The black wires are grounds.

A metre of what? Sorry I have no idea what are you talking about.

Are the data-connection connected (since you're testing this weird issue it might have been disconnected to focus on power)? Saw somewhere in the threads about the pin3 issue that some drives want the dataconnection in order to spin up

Hm, I'll try that but I doubt it's the case :(

 

[Alecmascot]

A metre of what? Sorry I have no idea what are you talking about.


a volt meter, multimeter

 

[Alecmascot]

Are the data-connection connected (since you're testing this weird issue it might have been disconnected to focus on power)? Saw somewhere in the threads about the pin3 issue that some drives want the dataconnection in order to spin up

the pin3 in on the power connector and can be used when there is a disk backplane of some kind, but there is no data connection to P3 in a cabled setup.