how to increase buffer size

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I download youtube videos on my raspberrypi 24/7
I am looking at a way to reduce the number of writes to the SD card.
I know the option --buffer-size SIZE (1024 or 16K). But that does not reduce the number of writes to the SD card even when I give the parameter 1024k.
I see the file size increase every second.

Is there any option to buffer the downloaded bytes (up to 10MB or 50MB) and then write to disk/card?

[yan12125]

--buffer-size is used in HTTP operations rather than disk operations.

I am looking at a way to reduce the number of writes to the SD card.

I believe modern operating systems have buffering. That is, files written to the disk are buffered in the kernel and then written to the actual media later. Increasing in the file size does not indicate that the contents are already written to the SD card. If the OS on Pi does not implement buffering, an alternative is downloading files to tmpfs and move it to the SD card with --exec.