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SSD Woes, spotty Booting with no entry and apple logo flashing

Apologies for such an old laptop. I’ve installed a Integral SSD 240gb and the boot is very spotty. After much research it seems to be down to the 6 GB/S SATA III on the drive and the 3 GB/S SATA II interface on the computer.

Cable replacement seems to be an option, would a new cable solve this?

The cable looks ok. Is down throttling the drive possible?

Any help greatly appreciated, been out the Mac game for a long time, hence the old MacBook.

Regards Ian

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Matching the drive to the systems I/O speed is the first thing I would do. This is more important when the drive is a SSD as it can push out the data faster than the system can handle.

Think of it like a faucet (tap), you open it slightly the water spills out with no splashing, Open it fully and a good amount of water is splashing out of the basin!

So the rate of output has a big bearing here! And thats the issue here!

The SATA standard was written so older slower drives could be used in newer systems (not the other way) at the time drives where more expensive than CPU’s!

As the drives improved many drives offered jumpers to adjust the interface. When Ethernet struggled with mismatching of 10 mbps devices connecting to 100 mbps hubs and switches it was clear a better system was needed. The IEEE 802.3 group managed to come to an agreement on how to sense the data rate so mis-matched data rates wouldn’t be an issue. So smart hubs and switches would offer a bridge internally between the two internal networks and depending on what the device was would connect to the proper network via the auto sense ports (system NIC’s, Hub, Switches or Routers)!

Well the SATA group liked this elegant idea! So special HDD/SSD devices which sensed the systems I/O rate and matched it came out! We call these drives Auto sense and the older as Fixed.

So for many years thats where we where! Well time marches on…

Today this extra circuit is mostly not needed as most systems today that are still running are SATA III (6.0 Gb/s) systems! With the pressure of price many drive makers have dropped this circuitry as most don’t need it.

So that leaves us in a bind as you need to have your wits when you have an older system like we have here, you need to review the drives spec sheet to make sure it offers compatibility to the slower SATA data rate your system needs (Auto Sense) if it only lists one SATA data rate its a fixed drive for that one data rate.

So where does that leave us here ??

Time to find the proper SSD for your system! You’ll need to find either an older Fixed SATA II (3.0 Gb/s) drive or find a Auto sense drive like a Samsung 860 EVO SSD which is one of the few SSD’s still offering auto sense technology!

  • Note the Interface line in the spec sheet: SATA 6 Gbps Interface, compatible with SATA 3 Gbps & 1.5 Gbps interfaces

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8 Commenti:

Dan, thank you Sir for the prompt reply. Moving forward, if I was to buy the recommended Samsung Evo, the multi interface will give me a clean boot? The blurb on the Integral says backwards compatibility, could it be a fault with the drive? It had the seal re-taped.




The Integral SSD's are re-packaged job lots. Basically, the buyer locates a drive maker and buys them from them (drives or over-stock) and they slap there labels on it. So depending on the drive some of them are fixed and others auto sense!

Your symptoms imply you have a fixed model. Its also possible you got a bad one if the packaging was re-sealed.

I know! Cheap is best for the pocket book, but quality make a working system!


I've noticed if I boot from a long standing period, the computer boots first time but if reboot I get the No Entry Flashing Apple logo. What could cause this?


@themrwibble - Here's a full breakdown of the different startup screens you can encounter If your Mac doesn't start up all the way

The one you encountered is the Prohibitory Symbol: If your Mac starts up to a circle with a line through it.

This gets into the drives boot records, so it loads sometimes and other times not. So when you first boot up there is a delay it works and the other times the delay is less so it messes up.


I'll buy an Evo tomorrow and see what happens


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themrwibble sarà eternamente grato.
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