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Laptop does not recognize ST91000640NS Seagate Constellation.2 1TB 2.5

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  • Hard Drives
  • Laptops
  • SATA
  • USB
  • Seagate
  • Storage
Last response: in Storage
June 9, 2011 4:31:54 AM

I just bought two ST91000640NS Seagate 1TB 2.5" 7,200 RPM drives.
Both work fine when connected to the SATA connectors in a desktop but not via a USB adaptor.
More important, the ST91000640NS's do not spin and are not detected by either of two new i7 laptops, an HP Envy or an Acer, either when connected directly to the laptop's SATA connectors or via a USB adaptor.
When connected to the laptop, either directly or via the USB, the ST91000640NS drives do not spin and are not visible to the laptop. But, to repeat, work fine when connected to a desktop via its SATA connectors.
The USB connectors I have tried are the Diablotec EN4228s and the Cavalry CABD2BR-BK Bulldog Series. Both work fine with 750GB 2.5" 5,400 RPM drives for example but not with the ST91000640NS's.
For the curious, the 15mm ST91000640NS drive will fit in the HP 17.3" Envy's second drive bay. For the Acer I planned to use the ST91000640NS as a 7,200 RPM 1TB external drive.
Can anyone tell me what I need to do to make the ST91000640NS's work with a laptop, either connected via the laptop's SATA connectoirs or via the USB adaptor as an external drive.

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June 9, 2011 9:04:11 AM

Is it possible that your drives are configured to Power Up In Standby (PUIS)? If so, then use HDAT2 or Hitachi's Feature Tool to disable PUIS.

Alternatively, are your USB adapters providing +12V power to the drive? Even though it is a 2.5" drive, the ST91000640NS draws power from both the +12V and +5V supplies. Your laptop may only be providing +5V power, as that was the norm for older 2.5" drives. Your USB port also only provides +5V power, so the USB-SATA adapter would need to be externally powered, via an AC adapter.

Constellation.2 SATA Product Manual:
http://www.seagate.com/staticfiles/support/docs/manual/...
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June 16, 2011 12:10:32 AM

fzabkar said:
Is it possible that your drives are configured to Power Up In Standby (PUIS)? If so, then use HDAT2 or Hitachi's Feature Tool to disable PUIS.

Alternatively, are your USB adapters providing +12V power to the drive? Even though it is a 2.5" drive, the ST91000640NS draws power from both the +12V and +5V supplies. Your laptop may only be providing +5V power, as that was the norm for older 2.5" drives. Your USB port also only provides +5V power, so the USB-SATA adapter would need to be externally powered, via an AC adapter.

Constellation.2 SATA Product Manual:
http://www.seagate.com/staticfiles/support/docs/manual/...


fzabkar, you hit the nail on the head! As you stated and i had not noticed, the ST91000640NS drive requires 12V power. The laptops i have, boht new, provide only 5V power and therefore do not power the ST91000640NS drives - no spin up, hence no BIOS recognition.

The ST91000640NS drives appear to be fine for desktop but not for laptops unless an independent source of 12V power is available.

The 12V requirement was the issue. Thank you!
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June 16, 2011 12:12:41 AM

Best answer selected by sbrunner.
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June 16, 2011 12:13:41 AM

fzabkar said:
Is it possible that your drives are configured to Power Up In Standby (PUIS)? If so, then use HDAT2 or Hitachi's Feature Tool to disable PUIS.

Alternatively, are your USB adapters providing +12V power to the drive? Even though it is a 2.5" drive, the ST91000640NS draws power from both the +12V and +5V supplies. Your laptop may only be providing +5V power, as that was the norm for older 2.5" drives. Your USB port also only provides +5V power, so the USB-SATA adapter would need to be externally powered, via an AC adapter.

Constellation.2 SATA Product Manual:
http://www.seagate.com/staticfiles/support/docs/manual/...


fzabkar, you hit the nail on the head! As you stated and i had not noticed, the ST91000640NS drive requires 12V power. The laptops i have, boht new, provide only 5V power and therefore do not power the ST91000640NS drives - no spin up, hence no BIOS recognition.

The ST91000640NS drives appear to be fine for desktop but not for laptops unless an independent source of 12V power is available.

The 12V requirement was the issue. Thank you!
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December 7, 2013 2:08:34 AM

I have same problem, but...is any change run same HDD inside?, as primary HDD, this disk is running, but i have problem with the bay model: thinkpad serial atat hard drive bay adapter III" disk working fine in usb socker or in desktop, but only bay is the problem. Is any solution exist? cheers
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