root@ubuntu:/home/gubuntu/Downloads# sfdisk /dev/sdb < /home/gubuntu/sfdisk_sdb.mod.txt
Checking that no-one is using this disk right now ...
OK

Disk /dev/sdb: 1023 cylinders, 122 heads, 62 sectors/track
Old situation:
Units = cylinders of 3872768 bytes, blocks of 1024 bytes, counting from 0

   Device Boot Start     End   #cyls    #blocks   Id  System
/dev/sdb1          0+      2-      3-      8031+   b  W95 FAT32
		start: (c,h,s) expected (0,0,2) found (0,1,1)
		end: (c,h,s) expected (2,15,6) found (62,253,1)
/dev/sdb2          2+      2-      1-      2047+  da  Non-FS data
		start: (c,h,s) expected (2,15,7) found (4,15,7)
		end: (c,h,s) expected (2,81,9) found (5,20,9)
/dev/sdb3          2+      3-      1-      2048   da  Non-FS data
		start: (c,h,s) expected (2,81,13) found (5,20,13)
		end: (c,h,s) expected (3,25,16) found (6,25,16)
/dev/sdb4          3+    486-    484-   1826974   83  Linux
		start: (c,h,s) expected (3,25,19) found (6,25,19)
		end: (c,h,s) expected (486,33,58) found (972,33,58)
Warning: given size (7744511) exceeds max allowable size (0)

sfdisk: bad input


root@ubuntu:/home/gubuntu/Downloads# e2fsck -f /dev/sdb4
e2fsck 1.42.5 (29-Jul-2012)
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information
/dev/sdb4: 17727/114240 files (1.2% non-contiguous), 113856/456743 blocks


root@ubuntu:/home/gubuntu/Downloads# resize2fs /dev/sdb4
resize2fs 1.42.5 (29-Jul-2012)
The filesystem is already 456743 blocks long.  Nothing to do!

root@ubuntu:/home/gubuntu/Downloads# fdisk -l

Disk /dev/sdb: 3965 MB, 3965190144 bytes
122 heads, 62 sectors/track, 1023 cylinders, total 7744512 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1               1       16063        8031+   b  W95 FAT32
/dev/sdb2           16064       20158        2047+  da  Non-FS data
/dev/sdb3           20162       24257        2048   da  Non-FS data
/dev/sdb4           24260     3678207     1826974   83  Linux