[oracle@localhost dev]$ sudo fdisk /dev/sdd

sudo: fdisk: command not found

[oracle@localhost ~]$ su - 
Password: 
[root@localhost ~]# fdisk /dev/sdd

Unable to open /dev/sdd
[root@localhost ~]# fdisk 

Usage: fdisk [-l] [-b SSZ] [-u] device
E.g.: fdisk /dev/hda  (for the first IDE disk)
  or: fdisk /dev/sdc  (for the third SCSI disk)
  or: fdisk /dev/eda  (for the first PS/2 ESDI drive)
  or: fdisk /dev/rd/c0d0  or: fdisk /dev/ida/c0d0  (for RAID devices)

[root@localhost dev]# cat /proc/partitions 
major minor  #blocks  name

   3     0   12582912 hda
   3     1   10843843 hda1
   3     2    1735020 hda2
   3    64   12582912 hdb
   3    65   12578863 hdb1
  22    64    4194304 hdd

[root@localhost dev]#  fdisk -l

Disk /dev/hda: 12.8 GB, 12884901888 bytes
255 heads, 63 sectors/track, 1566 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/hda1   *           1        1350    10843843+  83  Linux
/dev/hda2            1351        1566     1735020   82  Linux swap / Solaris

Disk /dev/hdb: 12.8 GB, 12884901888 bytes
255 heads, 63 sectors/track, 1566 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/hdb1   *           1        1566    12578863+  83  Linux

Disk /dev/hdd: 4294 MB, 4294967296 bytes
16 heads, 63 sectors/track, 8322 cylinders
Units = cylinders of 1008 * 512 = 516096 bytes

Disk /dev/hdd doesn't contain a valid partition table

[root@localhost dev]# cat  /var/log/dmesg |grep dev/ssd
[root@localhost dev]# 

[root@localhost dev]# cd  /dev/sdd
bash: cd: /dev/sdd: No such file or directory