Recent changes to WWFileFragmentCount2

WWFileFragmentCount2 modified by yamamoto2002

yamamoto2002 — Sat, 12 Jun 2021 22:38:10 -0000

--- v81
+++ v82
@@ -61,7 +61,7 @@

 Traditional HDD sector size is 512 bytes. Some of recent HDD has 4096 bytes sector size, those are called "4K sector" or "Advanced Format" hard drives:  https://en.wikipedia.org/wiki/Advanced_Format

-From the following documentation, there is a "hidden" 50 bytes of error correction code and 15 bytes of other housekeeping data for every 512 bytes sector data. The disk drive embedded microcontroller and its firmware manages those fields (those 65 bytes data is not exposed to the OS). https://www.seagate.com/tech-insights/advanced-format-4k-sector-hard-drives-master-ti/
+From the following documentation, there is a hidden 50 bytes of error correction code and 15 bytes of other housekeeping data for every 512 bytes sector data. The disk drive embedded microcontroller and its firmware manages those fields (those 65 bytes data is not exposed to the OS). https://www.seagate.com/tech-insights/advanced-format-4k-sector-hard-drives-master-ti/

 # About SMR hard drives

WWFileFragmentCount2 modified by yamamoto2002

yamamoto2002 — Thu, 10 Jun 2021 22:06:24 -0000

--- v80
+++ v81
@@ -4,7 +4,7 @@

 # Download

-Version 1.0.0 for Windows  https://sourceforge.net/projects/playpcmwin/files/others/WWFileFragmentCount2.zip/download
+Version 1.0.1 for Windows  https://sourceforge.net/projects/playpcmwin/files/others/WWFileFragmentCount2_101.zip/download

 # License

@@ -28,7 +28,9 @@

 # Changelog

-Version 1.0.0 : initial release.
+* Version 1.0.1 : Fix typo.
+
+* Version 1.0.0 : initial release.

 # Screenshot

WWFileFragmentCount2 modified by yamamoto2002

yamamoto2002 — Tue, 08 Jun 2021 23:43:18 -0000

--- v79
+++ v80
@@ -73,7 +73,7 @@
 * Delete some of the small files with random manner until free space becomes larger than the size of file ※1.
 * Write one relatively large file ※1 to the drive. This large file should be heavily fragmented.

-![Fragmentation illustrated](https://sourceforge.net/p/playpcmwin/wiki/WWFileFragmentCount2/attachment/Fragmentation3.png)
+![Fragmentation illustrated](https://sourceforge.net/p/playpcmwin/wiki/WWFileFragmentCount2/attachment/Fragmentation4.png)

WWFileFragmentCount2 modified by yamamoto2002

yamamoto2002 — Tue, 08 Jun 2021 23:33:57 -0000

--- v78
+++ v79
@@ -73,7 +73,7 @@
 * Delete some of the small files with random manner until free space becomes larger than the size of file ※1.
 * Write one relatively large file ※1 to the drive. This large file should be heavily fragmented.

-![Fragmentation illustrated](https://sourceforge.net/p/playpcmwin/wiki/WWFileFragmentCount2/attachment/Fragmentation2.png)
+![Fragmentation illustrated](https://sourceforge.net/p/playpcmwin/wiki/WWFileFragmentCount2/attachment/Fragmentation3.png)

WWFileFragmentCount2 modified by yamamoto2002

yamamoto2002 — Tue, 08 Jun 2021 23:29:43 -0000

--- v77
+++ v78
@@ -73,7 +73,7 @@
 * Delete some of the small files with random manner until free space becomes larger than the size of file ※1.
 * Write one relatively large file ※1 to the drive. This large file should be heavily fragmented.

-![Fragmentation illustrated](https://sourceforge.net/p/playpcmwin/wiki/WWFileFragmentCount2/attachment/Fragmentation.png)
+![Fragmentation illustrated](https://sourceforge.net/p/playpcmwin/wiki/WWFileFragmentCount2/attachment/Fragmentation2.png)

WWFileFragmentCount2 modified by yamamoto2002

yamamoto2002 — Tue, 08 Jun 2021 23:26:11 -0000

--- v76
+++ v77
@@ -29,6 +29,10 @@
 # Changelog

 Version 1.0.0 : initial release.
+
+# Screenshot
+
+![Screenshot](https://sourceforge.net/p/playpcmwin/wiki/WWFileFragmentCount2/attachment/FileFragmentationCountSS.png)

 # Source code

@@ -69,4 +73,7 @@
 * Delete some of the small files with random manner until free space becomes larger than the size of file ※1.
 * Write one relatively large file ※1 to the drive. This large file should be heavily fragmented.

-![Screenshot](https://sourceforge.net/p/playpcmwin/wiki/WWFileFragmentCount2/attachment/FileFragmentationCountSS.png)
+![Fragmentation illustrated](https://sourceforge.net/p/playpcmwin/wiki/WWFileFragmentCount2/attachment/Fragmentation.png)
+
+
+

WWFileFragmentCount2 modified by yamamoto2002

yamamoto2002 — Sun, 06 Jun 2021 06:57:09 -0000

--- v75
+++ v76
@@ -67,6 +67,6 @@
 * Prepare small capacity drive and format it.
 * Fill the entire drive with many small files.
 * Delete some of the small files with random manner until free space becomes larger than the size of file ※1.
-* Write one relatively large file to the drive. This large file should be heavily fragmented.
+* Write one relatively large file ※1 to the drive. This large file should be heavily fragmented.

 ![Screenshot](https://sourceforge.net/p/playpcmwin/wiki/WWFileFragmentCount2/attachment/FileFragmentationCountSS.png)

WWFileFragmentCount2 modified by yamamoto2002

yamamoto2002 — Sun, 06 Jun 2021 05:06:11 -0000

--- v74
+++ v75
@@ -53,7 +53,7 @@

 # About sector size and drive managed hidden field of HDDs

-Traditional HDD sector size is 512 bytes. Recent HDD has 4096 bytes sector size, those are called "4K sector" or "Advanced Format" hard drives:  https://en.wikipedia.org/wiki/Advanced_Format
+Traditional HDD sector size is 512 bytes. Some of recent HDD has 4096 bytes sector size, those are called "4K sector" or "Advanced Format" hard drives:  https://en.wikipedia.org/wiki/Advanced_Format

 From the following documentation, there is a "hidden" 50 bytes of error correction code and 15 bytes of other housekeeping data for every 512 bytes sector data. The disk drive embedded microcontroller and its firmware manages those fields (those 65 bytes data is not exposed to the OS). https://www.seagate.com/tech-insights/advanced-format-4k-sector-hard-drives-master-ti/

WWFileFragmentCount2 modified by yamamoto2002

yamamoto2002 — Sat, 05 Jun 2021 23:48:16 -0000

--- v73
+++ v74
@@ -61,12 +61,6 @@

 Shingled Magnetic Recording drives are more advanced HDDs than traditional Conventional Magnetic Recording HDDs and the sector number is virtualized: There is additional sector virtualization layer and there is a table to map sector number and physical sector number. On SMR drives, sequential sector number (or sequential LCN) does not mean those are contiguously stored to physical disk. Frequently updated sectors are stored in their CMR area and write-once-read-many-ish sectors are moved to SMR area when drive IO activity becomes low. SSDs have a similar mechanism with fast and small SLC area and slow and large QLC area.

-# About surveillance HDD
-
-There is a special purpose-built HDD for digital video recorders and surveillance storage devices. These HDD has a special requirements for the purpose where writing wrong data is rather more acceptable than write operation failed with many retries. It seems it is not recommended for typical computer usage where writing wrong data is not acceptable.
-
-These drives equip special ATA7 command for custom built video recording hardware to write several streams in parallel without hiccups, but ATA7 command is never issued from typical Windows computer.
-
 # How to create heavily fragmented file for testing

 * prepare one relatively large file (※1).

WWFileFragmentCount2 modified by yamamoto2002

yamamoto2002 — Sat, 05 Jun 2021 23:45:18 -0000

--- v72
+++ v73
@@ -63,7 +63,7 @@

 # About surveillance HDD

-There is a special purpose-built HDD for digital video recorders and surveillance storage devices. These HDD has a special requirements for the purpose where writing wrong data is rather more acceptable than write operation failed with many retry. It seems it is not recommended for typical computer usage where writing wrong data is not acceptable.
+There is a special purpose-built HDD for digital video recorders and surveillance storage devices. These HDD has a special requirements for the purpose where writing wrong data is rather more acceptable than write operation failed with many retries. It seems it is not recommended for typical computer usage where writing wrong data is not acceptable.

 These drives equip special ATA7 command for custom built video recording hardware to write several streams in parallel without hiccups, but ATA7 command is never issued from typical Windows computer.