hdparm command

How do I find out serial number information for my hard disk under Ubuntu Linux Gnome desktop environment?

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When I run hdparm -tT /dev/sda command under CentOS / RHEL I get the following error on screen:

/dev/sda:
Timing buffered disk reads: 908 MB in 3.00 seconds = 302.39 MB/sec
HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Inappropriate ioctl for device


How do I fix this problem?

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Can you tell me a Linux command to find out information about my hard disk such as description, product name, bus type, size, and cache memory size under Linux operating systems using command line options?

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How do I find out the make, model and serial number for my SCSI or IDE hard disks under CentOS Linux server? How do I get vendor information about my disk storage w/o opening my Intel / AMD server chassis?

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