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I have 6 hard disks in my computer and one DVD. The disk that I connect to the 6th SATA port is a regular disk. But my Windows 7 64 bit shows it as a removable drive. I can eject my hard disk! Just like a pen drive. If I connect another disk to the 6th port, I can eject that disk too. So it has nothing to do with the physical disk, it must be something related to Windows or BIOS

I don't understand why Windows 7 is seeing a normal hard disk as removable. In Computer Management - Disk Management, the disk looks identical to the others - there is nothing there to suggest the drive is different from the others. But in the tray I have the icon to eject it.

The motherboard model is ASUS F2A85 V PRO FM2 and it has 7 SATA ports. All the disks are formatted normally, no Dynamic Disk, no RAID, nothing special.

How can I tell Windows 7 to treat the disk exactly like the others, so it can't be ejected?

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in bios does the sata is properly listed? – BlueBerry - Vignesh4303 Nov 6 '13 at 10:06
That's probably your one and only eSATA port. Check if it's red port on your MB. eSATA – week Nov 6 '13 at 10:18
The disk is properly listed in BIOS. The 5th disk is identical also - ST3000DM001. I can see no difference between 5th and 6th in BIOS. – Bear Bear Nov 6 '13 at 10:50
The disk is not connected on the eSATA port. The eSATA port is on the rear of the motherboard (where the VGA, HDMI, audio and USB ports are) – Bear Bear Nov 6 '13 at 11:08

Its Normal for AHCI SATA mode which supports a feature called hot swapping : Enables you to swap hard disk without powering down the whole system

Citation : Internal SATA hard disk shows up as removable device on Windows 7

You are supposed to update Your SATA driver : Microsoft provide AHCI driver than install this hotfix

MS KB article :

INTEL than install Intel Rapid Storage Technology driver

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I have installed the last chipsed driver from the motherboard manufacturer (ASUS) and still I can eject my disk – Bear Bear Nov 19 '13 at 11:36

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