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- ══════════════════════════════════════════════════════════
- COMPARISON BETWEEN DOS FORMAT, FDFORMAT 1.8 AND 2M/2MF 1.3
- ══════════════════════════════════════════════════════════
-
- 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 984/1804K) are also as reliable as DOS standard 360-1.2-720-1.44.
-
-
- 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) │ 1,931,254 (1,886K) │ (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 FLOPDTR (Floppy Data Transfer Rate)
- utility, which reads/writes a complete diskette in whole-track blocks.
- All statistics shown are in Kb/sec. The physical limits are 36,62 Kb/sec
- at 300 Kbit/sec (5¼-DD and 2M 3½-DD) and 61,03 Kb/sec at 500 Kbit (5¼-HD
- and 3½-HD).
-
- ┌────────────────┬────────────────┐
- │ Double Density │ High Density │
- ├────────────────┼────────────────┤
- │ Read Write │ Read Write │
- ┌───────────────────────┼────────────────┼────────────────┼──────┐
- │ FORMAT (40/80t) │ 18.16 18.16 │ 30.13 30.13 │ │
- │ FDFORMAT (40/80t) (*) │ 22.11 22.12 │ 39.73 39.73 │ 5.25 │
- │ FDFORMAT (82t) (**) │ 25.00 25.00 │ 25.26 25.23 │ │
- │ 2MF /F (82t) │ 25.04 25.00 │ 46.33 46.33 │ (5¼) │
- │ 2MF /M (82t) │ 16.49 16.49 │ 28.50 28.47 │ │
- ├───────────────────────┼────────────────┼────────────────┼──────┤
- │ FORMAT (40/80t) │ 15.05 15.05 │ 30.14 30.14 │ │
- │ FDFORMAT (40/80t) (*) │ 19.32 19.32 │ 39.58 39.53 │ 3.5 │
- │ FDFORMAT (82t) (**) │ 21.78 21.75 │ 24.79 24.79 │ │
- │ 2MF /F (82t) │ 25.72 25.76 │ 48.49 48.50 │ (3½) │
- │ 2MF /M (82t) │ 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.
- ─────────────────
- ┌────────────────┬────────────────┐
- │ Double Density │ High Density │
- ┌───────────────────────┼────────────────┼────────────────┼──────┐
- │ FORMAT (40/80t) │ 0:37 │ 1:13 │ │
- │ FDFORMAT (40/80t) (*) │ 0:42 │ 1:24 │ 5.25 │
- │ FDFORMAT (82t) (**) │ 1:28 │ 1:52 │ │
- │ 2MF /F (82t) │ 1:26 │ 1:29 │ (5¼) │
- │ 2MF /M (82t) │ 2:37 │ 2:38 │ │
- ├───────────────────────┼────────────────┼────────────────┼──────┤
- │ FORMAT (40/80t) │ 1:24 │ 1:34 │ │
- │ FDFORMAT (40/80t) (*) │ 1:38 │ 1:42 │ 3.5 │
- │ FDFORMAT (82t) (**) │ 1:46 │ 2:17 │ │
- │ 2MF /F (82t) │ 1:39 │ 1:47 │ (3½) │
- │ 2MF /M (82t) │ 2:51 │ 3:22 │ │
- └───────────────────────┴────────────────┴────────────────┴──────┘
- (*) 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.
-
-
- 5. - NOTE.
- ──────────
- The /X and /Y switches of FDFORMAT used during all this tests are
- listed here:
- ┌─────────────────────┐
- │ /X /Y │
- ┌───────┼──────────┬──────────┤
- │ 5¼-DD │ 1 │ 3 │
- │ 5¼-HD │ 2 │ 3 │
- │ 3½-DD │ 1 │ 2 │
- │ 3½-HD │ 2 │ 3 │
- └───────┴──────────┴──────────┘
-