Dear All,
i have purchased new sata 250 hdd to replace my old sata hdd.when i attached my new hdd then it was not detecting in my system..i am using redhat O.S...kindly tell me what,s happening in system and what should i do for it..

Please use useful thread titles. Something informative to others.

what version of redhat is this?

Nothing will ever happen to a new disk just by physically connecting it. It almost certainly IS detected, but you need to put filesystems on it etc. So what do you want to do with it? and what is your current partition layout?

To add to what's been said, if you're using RHEL, you should be PAYING for it...if you're not, you will only wind up with a system that doesn't get patches/bugfixes/security updates, and be unstable. If you ARE paying, call Red Hat support, and they can help you.

Otherwise, what did you think would happen? What happens in Windows when you plug in a disk? It just sits there...until you format it, and make it available. Linux is no different. Chances are, the system saw the new drive, and presented the new device. The first disk will be /dev/sda, second /dev/sdb, etc. The partitions are /dev/sda1, etc.

Do you still have the old hard drive connected to the computer or did you remove and put the new one in place?

It will be normal behavior if you are taking out the Hard Drive with the OS and plugin a blank one.

Install an Operating system on it for it to become functional.

Good luck to you

If you can get into a cmd line terminal, try (as root)
that's a lowercase L by the way

See what you have for drives when you do not have it in there and when you do.

Likely your primary SATA will show up as /dev/sda and this drive will show up as a different letter; however it is best to check what your existing drive shows up as, install this new drive and then see the letter it gets mapped too. From there you can use fdisk to partition the drive and then use mkfs.<file-system-type> to create a file system.

Next, what exactly do you want to do? Do you want to fully replace your old SATA drive with this new one?

If that's the case, then maybe take the old one out, install Linux fully, add the old one back in and copy over files you wish to retain. Otherwise you'll still be running off that old SATA drive which you wished to replace.