October 2026 – MILDS

Sysadmin

Linux tar Pitfalls: 3 Default Behaviors That Bite

Three tar defaults bite: which argument -f eats, whether extraction overwrites same-named files, and how links are stored. All commands tested in WSL.

2026-10-27

Sysadmin

Linux Disk Usage: Why du and df Disagree

df reads the filesystem ledger, du counts file by file. Hard links, sparse files, mount points, deleted-open files and metadata cause the gap. Tested in WSL.

2026-10-27

Hardware FEATURED

RTX 5080 Up ¥2,000, 32GB DDR5 Kits Up 434.2%: What to Buy Now

Three lines rose at once in late October 2026: 32GB DDR5 kits +434.2%, SSD contract prices +303% YoY, RTX 5080 up ¥2,000. What to buy now, what to wait for.

2026-10-27

Sysadmin

MySQL Autostart: Check mysql vs mysqld Before systemctl enable

Autostart is just a symlink: enable only links the unit, never starts the service, and mysql/mysqld/mariadb names are easy to mix up (tested on WSL).

2026-10-26

Sysadmin

Recovering Deleted Files on Linux: /proc/fd, PhotoRec or extundelete

Two ways to save a deleted file: pull it from /proc/PID/fd while the process is open, or carve it by signature with PhotoRec before blocks are overwritten.

2026-10-26

Sysadmin