FDFLUSH(8)

📦 version 1.0.1.3build1, in ubuntu jammy

💾 NAME 💾

okay so bestie, say hi to fdflush — the little section-8 (System Manager's Manual) icon that forces your floppy disk drive to actually notice when you swapped the disk. yes, that's the whole job. and it's a very important job. 🎀

✨ SYNOPSIS ✨

fdflush [device]

🌸 DESCRIPTION 🌸

ngl, fdflush is basically a band-aid for a very common PC hardware problem, and it is not the floppy's fault (okay it kind of is). here's the tea: a lot of PC floppy disk drives literally cannot tell when the disk inside has been changed. 💀

so what happens? you swap the disk, and the drive just... keeps reading buffered data from the previous disk instead of the new data from the disk that's currently sitting in there. it's giving "living in the past" energy and it is NOT it.

running fdflush makes the system believe the disk-change switch has been actuated, and in response to that information the system discards the buffered blocks. slay. problem solved. ✨

but listen — if you're the proud owner of one of these slightly-broken disk drives, you're gonna have to run fdflush every single time you change a disk. no cap. every time. 🫶

the kernel uses two different ioctl commands to flush buffers. one of them is the generic one (BLKFLSBUF), and the other is the floppy-specific one (FDFLUSH). fdflush calls both of them, and it only reports an error if both fail. double the effort, double the slay. 💅

🦋 OPTIONS 🦋

  • device — the name of the floppy disk device, in the form /dev/fd1. the default is /dev/fd0. 🍓

👑 EXIT CODES 👑

she's got range, and she's got receipts. here's what each exit code is telling you:

  • Zero — success, periodt. 💖
  • one — ioctl error. 😭
  • two — inability to open the floppy (or other) device. 🙈
  • three — usage error. 💀

🧚 BUGS 🧚

lowkey the bugs aren't even in the software — they're in your hardware. the fix is a vibe check on your actual drive: try swapping in another floppy drive to see if this problem goes away. 🔥

🌈 FILES 🌈

  • /dev/fdN — floppy disk device. ⭐

💜 AUTHOR 💜

Bruce Perens Bruce@Pixar.com . — main character energy, honestly, we stan. 👑

and that's the whole page bestie!! this lil gem comes to you courtesy of Debian and the Debian Utilities, living in section 8 of the manual, FDFLUSH(8). go flush those buffers. mwah. 💅✨🎀

📦 where this page comes from