Consider a disk with sector size of 512 bytes, 1000 tracks per surface, 50 sectors per track, five (5) double-sided platters, and average seek time of 8 msec. supposed that the disk platters rotate at 7400 rpm (revolutions per minute).
supposed also that a block (page) of 2048 bytes is chosen. now, consider a file with 150,000 records of 100 bytes each that is to be stored on such a disk and that no record is allowed to span two blocks. also, no block can span two tracks.

a. how many records fit onto a block?
b. how many blocks are required to store the entire file? if the file is arrange "sequentially on the disk, how many cylinders are needed?
c. how many records of 100 bytes each can be stored usin this disk?
d. what time is required to read a file containing 100,000 records of 100 bytes each sequentially? you can make an assumption about how long it takes moving the heads from one cylinder to the next here.
e. what is the time required to read a file containing 100,000 records of 100 bytes each in a random order? to read a record, the block containing the record has to be fetched from the disk. assume that each block request incurs the average seek time and rotational delay. you need also to include the transfer time for each block.

Your task this week is to write a very simple spam classifier in python. it will classify messages as either spam (unwanted) or ham (wanted). the program will have a set of spam_words, words that are known to appear in spam messages. that set is included in the template file spam.pypreview the document. you will also define a spam threshold which reflects the allowed percentage of spam words in the message. you'll compute a 'spam indicator', which is the ratio of spam words to the total number of unique words in the message. if the spam indicator exceeds the spam threshold, the message is classified as spam. otherwise it is classified as ham. we'll assume that the spam threshold is a constant and has a value of 0.10. your program will prompt the user for a message and then will print the corresponding spam indicator with two decimal digits and the corresponding classification (spam or ham). the program will be case insensitive. the spam words are detected whether they are in lower case or upper case or mixed case. each word, spam or not, is counted once (even if it appears multiple times in the message.) the program will remove punctuation from the message before identifying the words and computing the spam indicator. for example '! ' must be identified as the spam word 'now'.

When creating a presentation in libre office impress, where does the editing of slides take place?

Apython programming question: assume s is a string of lower case characters. write a program that prints the number of times the string 'bob' occurs in s. for example, if s = 'azcbobobegghakl', then your program should print number of times bob occurs is: 2