# File Storage Technologies - 9

1. Part of file metadata
 - Time and date of creation
 - Author name
 - Last modified
 - Access permission

2. Difference between block storage and file storage technologies,
 >File storage devices can control content

 ![image.png](https://cdn.hashnode.com/res/hashnode/image/upload/v1656410893718/6soSms35D.png align="left")
 
3. Available options for volume formatting in Windows platforms,
 - NTFS,
 - FAT16,
 - FAT32

4. Linux command allows a file to be fully controlled by any system user 
 >chmod 777

5. SAN vs NAS differences,
 - SAN uses Fibre Channel protocol
 - NAS supports RAID, uses NFS (Network File System) or SMB, supports disk aggregation
 - Both SAN and NAS create volumes
 - >![image.png](https://cdn.hashnode.com/res/hashnode/image/upload/v1656413598810/KMdsjMYyT.png align="left")
6. Fact about Mount protocol,
 > allows a client to attach a remote directory tree to a local file system

7. SMB (Server Message Block) architecture, 
_POSIX (Portable Operating System Interface) is not part of this architecture._

8. The most commonly used access protocol for cloud file-hosting services, __HTTP__

9. The file access protocol used to store VM files from VMware ESXi, __NFS__

#### Linux command `chmod`
- read : 4
- write : 2
- execute : 1

```
// restricting access to a file
$chmod u=rwx,g=rx,o=r sample.txt

//granting full access to a file
$chmod 777 sample.txt

//restricting again
$chmod 755 sample.txt
```