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1994-05-31
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══════════════════════════════════════════════════════════
COMPARISON BETWEEN DOS FORMAT, FDFORMAT 1.8 AND 2M/2MF 2.1
══════════════════════════════════════════════════════════
Note: If you are a DISKCOPY or FORMAT programs
programmer, read the note at the end of
this file as soon as possible.
2M is not only the highest capacity formatter at this moment, but
also 2M diskettes are the faster ones. This test will show it to you.
Note that some absolute results may slightly vary from one computer to
another, but the relation between formatter programs doesn't vary. If
you decide to use 2M, you will realize that default formats (820/1476K
and 984/1804/3608K) are also as reliable as DOS standard 360K/1.2M and
720K/1.44/2.88M).
1. - MAXIMUM STORAGE AFTER FORMAT.
──────────────────────────────────
Physical limits are 1,025,000 for 5¼-DD (with 82 tracks) and 1,708,224
bytes in 5¼-HD. In 3½-DD (high density controller card at 300 Kbit/sec)
the limit is 1,230,000 bytes; in 3½-HD, 2,050,000 bytes.
┌────────────────────┬────────────────────┐
│ Double Density │ High Density │
┌──────────────────────┼────────────────────┼────────────────────┼──────┐
│ FORMAT (40/80t) │ 368,640 (360K) │ 1,228,800 (1,200K) │ │
│ FDFORMAT (82t) │ 839,680 (820K) │ 1,511,424 (1,476K) │ 5.25 │
│ 2MF /F (82t) │ 839,680 (820K) │ 1,511,424 (1,476K) │ │
│ 2MF /M (82t) │ 923,648 (902K) │ 1,595,392 (1,558K) │ (5¼) │
├──────────────────────┼────────────────────┼────────────────────┼──────┤
│ FORMAT (40/80t) │ 737,280 (720K) │ 1,474,560 (1,440K) │ │
│ FDFORMAT (82t) │ 839,680 (820K) │ 1,763,328 (1,722K) │ 3.5 │
│ 2MF /F (82t) │ 1,007,616 (984K) │ 1,847,296 (1,804K) │ │
│ 2MF /M (82t) │ 1,091,584 (1,066K) │ 1,931,264 (1,886K) │ (3½) │
└──────────────────────┴────────────────────┴────────────────────┴──────┘
┌────────────────────┐
│ Extra High Density │
┌──────────────────────┼────────────────────┼──────┐
│ FORMAT (40/80t) │ 2,949,120 (2,880K) │ │
│ 2MF /F (82t) │ 3,694,592 (3,608K) │ 3.5 │
│ 2MF /M (82t) │ 3,862,528 (3,772K) │ (3½) │
└──────────────────────┴────────────────────┴──────┘
2. - PERFORMANCE AT DOS LEVEL.
──────────────────────────────
In order to compare the real performance of different diskette formats,
here are the results of a simple test. To simplify, only 3.5-HD diskette
results are shown. The TEST directory of hard disk contained two files of
256 Kb, 3 files of 128 Kb, 4 files of 64 Kb, 5 files of 32 Kb, 6 files of
16 Kb and 1 file of 15.5 Kb, totalling 1423.5 Kb on 21 files.
Write test: COPY C:\TEST\*.* B:
Read test: COPY /B B:\*.* NUL
┌────────────────┬─────────┬─────────┬─────────┬─────────┬─────────┬─────────┐
│ Disk Size │ 1.44 │ 1.44 │ 1.64 │ 1.72 │ 1.80 │ 1.88 │
├────────────────┼─────────┼─────────┼─────────┼─────────┼─────────┼─────────┤
│ Formatter │ FORMAT │FDFORMAT │FDFORMAT │FDFORMAT │ 2MF │ 2MF │
├────────────────┼─────────┼─────────┼─────────┼─────────┼─────────┼─────────┤
│ Write time │ 1:17.27 │ 1:06.72 │ 1:00.74 │ 1:27.05 │ 1:15.30 │ 1:23.93 │
├────────────────┼─────────┼─────────┼─────────┼─────────┼─────────┼─────────┤
│ Read time │ 0:59.82 │ 0:48.50 │ 0:44.11 │ 1:05.69 │ 0:43.78 │ 0:54.16 │
├────────────────┼─────────┼─────────┼─────────┼─────────┼─────────┼─────────┤
│ Free space left│ 0 │ 0 │ 203,776 │ 287,744 │ 370,688 │ 454,656 │
├────────────────┼─────────┼─────────┼─────────┼─────────┼─────────┼─────────┤
│ Write (Kb/sec) │ 18.42 │ 21.34 │ 23.44 │ 16.35 │ 18.90 │ 16.96 │
├────────────────┼─────────┼─────────┼─────────┼─────────┼─────────┼─────────┤
│ Read (Kb/sec) │ 23.80 │ 29.35 │ 32.27 │ 21.67 │ 32.51 │ 26.28 │
├────────────────┼─────────┼─────────┼─────────┼─────────┼─────────┼─────────┤
│ Kb/sec average │ 21.11 │ 25.35 │ 27.86 │ 19.01 │ 25.71 │ 21.62 │
│ Relative Index │ 100.00 │ 120.09 │ 131.98 │ 90.05 │ 121.79 │ 102.42 │
└────────────────┴─────────┴─────────┴─────────┴─────────┴─────────┴─────────┘
Notes:
- The test was executed on MS-DOS 6.2 with only 2M and FDREAD in memory.
- /B switch is necessary to COPY binary files onto character device as NUL.
- Reading from hard disk takes 5.5 sec (measured with the command COPY /B
C:\TEST\*.* NUL), this time was subtracted from write test's time.
- Diskette drive motor was on when COPY started.
- FDFORMAT diskettes were formatted with /X:2 and /Y:3 switches.
3. - PERFORMANCE AT FULL-TRACK ACCESS LEVEL.
────────────────────────────────────────────
This results are obtained with the 2M-FDTR (Floppy Data Transfer Rate)
utility, which reads/writes a complete diskette in whole-track blocks,
always taking care on never using buffers across 64K DMA frontier (which
will results in less performance). All statistics shown are in Kb/sec.
The physical limits are: 36,62 Kb/sec at 300 Kbps (5¼-DD and 2M 3½-DD)
and 61,03 Kb/sec at 500 Kbps (5¼-HD and 3½-HD). This results are only
possible on AT computers.
┌────────────────┬────────────────┬────────────────┐
│ Double Density │ High Density │ Extra High D. │
├────────────────┼────────────────┼────────────────┤
│ Read Write │ Read Write │ Read Write │
┌───────────────┼────────────────┼────────────────┼────────────────┼──────┐
│ FORMAT │ 18.16 18.16 │ 30.13 30.13 │ │ │
│ FDFORMAT (*) │ 22.11 22.12 │ 39.73 39.73 │ │ 5.25 │
│ FDFORMAT (**) │ 25.00 25.00 │ 25.26 25.23 │ │ │
│ 2MF /F │ 25.04 25.00 │ 46.33 46.33 │ │ (5¼) │
│ 2MF /M │ 16.49 16.49 │ 28.50 28.47 │ │ │
├───────────────┼────────────────┼────────────────┼────────────────┼──────┤
│ FORMAT │ 15.05 15.05 │ 30.14 30.14 │ ??.?? ??.?? │ │
│ FDFORMAT (*) │ 19.32 19.32 │ 39.58 39.53 │ -- -- │ 3.5 │
│ FDFORMAT (**) │ 21.78 21.75 │ 24.79 24.79 │ -- -- │ │
│ 2MF /F │ 25.72 25.76 │ 48.49 48.50 │ ??.?? ??.?? │ (3½) │
│ 2MF /M │ 16.25 16.25 │ 28.74 28.77 │ ??.?? ??.?? │ │
└───────────────┴────────────────┴────────────────┴────────────────┴──────┘
(*) DOS standard formats (360-720-1.2-1.44) and best /X and /Y.
(**) Maximum capacity formats (820-1.48-1.72) and best /X and /Y.
4. - FORMAT TIME.
─────────────────
All results are been obtained in a 386-25 computer.
┌────────────────┬────────────────┬────────────────┐
│ Double Density │ High Density │ Extra High D. │
┌───────────────┼────────────────┼────────────────┼────────────────┼──────┐
│ FORMAT │ 0:37 │ 1:13 │ │ │
│ FDFORMAT (*) │ 0:42 │ 1:24 │ │ 5.25 │
│ FDFORMAT (**) │ 1:28 │ 1:52 │ │ │
│ 2MF /F │ 1:24 │ 1:30 │ │ (5¼) │
│ 2MF /M │ 2:33 │ 2:34 │ │ │
├───────────────┼────────────────┼────────────────┼────────────────┼──────┤
│ FORMAT │ 1:24 │ 1:34 │ ?:?? │ │
│ FDFORMAT (*) │ 1:38 │ 1:42 │ -- │ 3.5 │
│ FDFORMAT (**) │ 1:46 │ 2:17 │ -- │ │
│ 2MF /F │ 1:37 │ 1:45 │ ?:?? │ (3½) │
│ 2MF /M │ 2:46 │ 3:19 │