Research:
A.) Research the size of operating system software by finding the amount of secondary storage (disk) space required by different versions of the same operating system or different operating system. If their sizes are substantially different ,explain why that may be the case, such as such platform issues ,features,etc.
Answer:
Win 3.1 ~15MB, although it requires at least MS-DOS 6.22 to boot, so tack on another few megs.
Win 95 b ~80MB
Win 98 SE ~300MB
Win 2000 Pro ~720MB with no service packs. After SP4, it's around 1GB.
Win XP Pro, ~1.2GB with SP2.
Suse 9.2
Slackware 10.1
Ubuntu
Linspire 4.5
Mandriva 10.1
B.) Consult current literature to research file-naming conversations for four different operating systems(not including UNIX,MS-DOS,Windows, or Linux).Note the acceptable range of characters,maximum length,case sensitivity,etc.Give examples of both acceptable and unacceptable filenames . For For extra credit,explain how the File Managers for those operating systems shorthen long filenames in their internal list to make them easier to manipulate.Cite your sources.
answer:
DEC VAX VMSAcceptable range of characters – A-Z 0-9 $ - _Maximum length – 255 file name & 32 extensionsCase sensitivity – insensitiveReserved Characters – noneAcceptable – kL209_pp.doxUnacceptable – fill\this.t!LISO 9660Acceptable range of characters – A-Z 0-9 _ .Maximum length – 255 file name Case sensitivity – insensitiveReserved Characters – noneAcceptable – kL209_pp.doxUnacceptable – fill\this.t!LMAC OS HFSAcceptable range of characters – 8-bit setMaximum length – 255 file name Case sensitivity – insensitive & perservationReserved Characters – :Acceptable – kL209_pp.doxUnacceptable – fill:this.t!L
Source:http://newitsc1405.blogspot.com/2011/02/chapter-8-research.html
Exercises
1. Explain in your own words why file dealloction is important and what would happen if it did not occur on regular basis.
Answer:
Deallocation is important because it frees up resources for other processes, files, etc. and If ,it is did not occur on a regular basis then there would be limited services and a computer can perform at one time or over a period of time.
2. Describe how file manager allocates a file to a single user.List steps that you think would be followed and explain your reasoning.
Answer:
file manager is allocates a file first through finding the secondary storage devices and after that ,it loads the files to memory while they updates the records of the running file at the time.
3. Is device independence important to the File Manager?Why o why not?Describe the consequences if that were not the case.
Answer:
yes,because property of a computer program whose successful execution (without recompilation) does not depend on the type of physical unit associated with a given logical unit employed by the program.
4. Do you think that file retrieval is different on a menu-driven system and command driven-system? Explain your answer and describe any differences between the two. Give an example of when each would be preferred over the other.
Answer: the difference is in the interface which where they work together.
5. Imagine one real life example of each: a multi-file volume and a multi-volume file. Include a description of the media used for storage and a general description of the data in the file.
answer:
In real life the multi-file volume is just like our life that is only one which only god can manage and knows our life will end.
As multi-volumes files is just like the Gods love which he share in his people and his people
share their love back at him.
6. As described in this chapter, files can be formatted with fixed-lenght fields or variable-length fields. In your opinion, would it be feasible to combine both formats in a single disk? Explain the reasons for your answer.
Answer:
No,its not feasible to combine both formats in a single disk because the two fields are in different areas.
7. Explain why it's difficult to support direct access to files with variable-length records. Suggest a method for handling this type of file if direct access is recquired.
Answer:
It is difficult to direct access because it is hard to find the exact location of records ,such as we suggest the variable-length record because it is the easy to access file directly at the period of time.
8. Give an example of the names of three files from your own PC that do not reside at the root or master directory. For each file, list both the relative filename and it's complete filename.
8. Give an example of the names of three files from your own PC that do not reside at the root or master directory. For each file, list both the relative filename and it's complete filename.
Answer:
*.exe - 1701_Gold_Trn_P.exe
*.ttf - Dovah.ttf
*.pdf - 1701AD_GOLD_Manual.pdf
