Mell How do you calculate bytes per cylinder?
1 Cylinder = 55,996 * 15 = 839,940 bytes. 1 Megabyte = 1,048,576 (2 to the 20th power) bytes.
How many blocks are in a cylinder?
A track has 25 blocks, a cylinder has 25*10=250 blocks.
How many kilobytes are in a cylinder?
For an approximate conversion between cylinders and megabytes, use the formula “1 cylinder = 600 KB” (1 KB = 1024 bytes, 1024 KB = 1 MB). For conversion between cylinders and tracks, use the formula “1 cylinder = 15 tracks”.
How many bytes is a 3390 cylinder?
Direct access storage devices
| Type | Most Efficient Block Size | Bytes/Cyl Avail for User Records |
|---|---|---|
| 3390 Model 3 | 27,998 4 | 849,960 |
| 3390 Model 9 | 27,998 4 | 849,960 |
| 9345 Model 1 | 22,928 4 | 696,840 |
| 9345 Model 2 | 22,928 4 | 696,840 |
How many cylinders does a mod 54 have?
3390 disk numbers
| Model | Model 1 | Model 54 |
|---|---|---|
| Tracks per Volume | 16,695 | 982,800 |
| Cylinders per Volume | 1,113 | 65,520 |
| Bytes per Volume | 946 MB | 55.6 GB |
How many sectors does a cylinder have?
16 065 sectors
As larger hard disks have come into use, a cylinder has become also a logical disk structure, standardised at 16 065 sectors ( 16065=255×63 ).
How do you calculate block size?
Measure the length and height of the block in inches and then substitute the values in the equation square feet of block = (length of block x height of block) / 144. For example, a standard cement block measures 16 x 8 inches, so it covers 0.89 square feet — (16 x 8) / 144 = 0.89.
How is space calculated in JCL?
Determine the actual BLKSIZE you will use.
- Determine the blocking factor (number of logical records in 1 physical record) you will use. This is usually considered optimal – 23476/record length. For 80 byte records, 23476 / 80 = 293.
- Determine the BLKSIZE – 293 * 80 = 23440.
How many GB is a track?
/ 1GB holds roughly 230 songs (at 128kbps). That’s roughly 16 hours of music or 20 albums. / The average 2 hour movie is 1.5GB.
How much MB is a track?
The average song is 3.5 mins therefore 30.73 MB per average song.
How much is the IBM 3390?
First customer deliveries of the 3390 Models 1 and 2 were scheduled for December 1989 at prices ranging from $90,000 to $275,000. A typical configuration consisting of three 3390 Model units was priced at $759,000.
How many bytes is a sector?
512 bytes
Each sector stores a fixed amount of user-accessible data, traditionally 512 bytes for hard disk drives (HDDs) and 2048 bytes for CD-ROMs and DVD-ROMs. Newer HDDs use 4096-byte (4 KiB) sectors, which are known as the Advanced Format (AF).